Geography and Mountain Ranges

The Nagorno-Karabakh region sits within the eastern portion of the Armenian Highlands, dominated by the rugged folds of the Lesser Caucasus Mountains. This is not a gentle landscape. The terrain is defined by steep mountain ranges, deep river gorges, and high plateaus that have shaped human settlement, military strategy, and economic activity for centuries. The highest peaks in the area, such as Mount Mrav (also known as Murovdag), rise to over 4,000 meters, creating formidable natural barriers that influence weather patterns and isolate communities.

The mountain ranges create a series of natural corridors and choke points. The Karabakh Range runs from northwest to southeast, forming a spine that divides the region. To the east, the land descends into the lowland plains of Azerbaijan, while to the west, the terrain remains rugged and elevated, connecting to the core of the Armenian highlands. This asymmetry is critical: the high ground offers defensive advantages, but the eastern slopes are more vulnerable to mechanized advances from the lowlands. The geography is not just a backdrop; it is an active participant in the conflict.

Numerous valleys, carved by rivers such as the Tartar, Khachen, and Karkar, provide fertile strips for agriculture and tend to concentrate both settlements and movement routes. These valleys have historically served as invasion routes and lines of communication. The dense forests that cover the middle slopes have offered cover for guerrilla operations, while the alpine meadows above the treeline provide seasonal grazing. This complex and layered geography makes the region difficult to control uniformly; a force may hold the heights but struggle to secure the valleys, and vice versa.

Ethnic Composition and Historical Divisions

The population of the Nagorno-Karabakh region has been predominantly ethnic Armenian for centuries, but this demographic reality exists within a patchwork of historical and legal claims. The modern dispute traces its roots to the early 20th century, but the ethnic geography was cemented during the Soviet era. According to the last Soviet census in 1989, the Nagorno-Karabakh Autonomous Oblast (NKAO) was approximately 76% Armenian and 23% Azerbaijani. However, these figures do not capture the full picture, as there were sizable Azerbaijani populations in the surrounding districts that were later drawn into the conflict.

The Soviet decision in 1923 to create the NKAO as an autonomous region within the Azerbaijan Soviet Socialist Republic, rather than attaching it to Armenia, was a political compromise that sowed the seeds of future war. The Armenian population viewed this as an injustice, while Azerbaijan viewed any challenge to its territorial integrity as a threat. Over the subsequent decades, the ethnic division hardened. Armenians in the region looked to Yerevan, spoke Armenian, and maintained distinct cultural traditions. The Azerbaijani minority, concentrated in the lowland villages and the town of Shusha (Shushi), was equally rooted in Azerbaijani culture and identity.

By the late Soviet period, these divisions had become politically explosive. The Nagorno-Karabakh conflict is often framed as a classic ethnic territorial dispute, but it is also a structural problem of borders and self-determination. The Armenian population demanded unification with Armenia, citing the principle of self-determination. Azerbaijan insisted on the inviolability of its Soviet-era borders. This clash of principles—self-determination versus territorial integrity—remains the core legal and political deadlock.

The Devastating Wars of the 1990s and 2020s

The collapse of the Soviet Union in 1991 triggered a full-scale war. From 1992 to 1994, Armenian forces, with support from Armenia proper, captured not only the Nagorno-Karabakh region itself but also seven surrounding Azerbaijani districts, creating a buffer zone. This resulted in the displacement of approximately 600,000 Azerbaijanis from those occupied territories and about 300,000 Armenians from other parts of Azerbaijan. The war ended with a Russian-brokered ceasefire in 1994, but no peace treaty was signed. The region remained a frozen conflict, with the unrecognized Republic of Artsakh (Nagorno-Karabakh) functioning as a de facto independent state.

After decades of stalled negotiations, the conflict reignited in September 2020. This war was fundamentally different. Azerbaijan, armed with modern Turkish and Israeli drone technology, and backed by Turkey, broke through Armenian defenses in the south, capturing the strategic town of Shusha and key territory. A Russian-brokered ceasefire on November 9, 2020, ended the 44-day war with Azerbaijan reclaiming the seven surrounding districts and a significant portion of Nagorno-Karabakh itself. Russian peacekeepers were deployed along the line of contact. The 2020 war reshaped the territorial reality on the ground.

The situation remained volatile. In September 2023, Azerbaijan launched a rapid military offensive. Within 24 hours, the de facto Artsakh government surrendered. The result was the near-total flight of the ethnic Armenian population from Nagorno-Karabakh. Over 100,000 Armenians fled to Armenia in a matter of days, effectively emptying the region of its Armenian inhabitants. This event represented a dramatic and tragic conclusion to the demographic dispute. The region that had been predominantly Armenian for centuries under the NKAO and the de facto republic was now depopulated of its Armenian population.

Impact of Geography on Conflict and Strategy

The mountainous terrain has been a determining factor in military operations throughout the conflict. During the first war (1992-1994), the defensive advantages of the high ground allowed relatively small Armenian forces to hold off larger Azerbaijani assaults. The region's rugged geography favored defenders who knew the terrain and could use the peaks and forests for ambushes and observation. Key strategic heights and mountain passes became bitterly contested objectives. Control of the Lachin Corridor, a narrow mountain road connecting Nagorno-Karabakh to Armenia, was essential for survival of the de facto republic.

The 2020 war demonstrated how technology could partially overcome terrain constraints. Azerbaijan used Turkish Bayraktar TB2 drones and Israeli loitering munitions to devastate Armenian armored columns and artillery positions in the open valleys and on exposed ridge lines. The drones could spot and strike targets that were hidden from ground observation, but the terrain still restricted maneuver. The fighting in the mountains around Shusha and in the forests of the south was brutal, house-to-house, forest-to-forest combat. Even with technological advantages, the geography imposed a grinding pace of advance.

Strategic Passes and Lines of Communication

Control over specific geographical features has repeatedly decided the fate of campaigns. The town of Shusha, sitting on a plateau overlooking Stepanakert (Khankendi), is the most important strategic position in the region. Whoever holds Shusha controls access to the capital and the high ground that commands the entire valley. The 2020 war ended when Azerbaijani forces captured Shusha after days of uphill fighting. The subsequent 2023 offensive was similarly efficient because Azerbaijani forces had already occupied the key heights and had established dominance of the line of contact.

The Berdadzor (Lachin) Corridor is another critical geographic feature. This narrow, mountainous route is the only direct road connecting Nagorno-Karabakh to Armenia. Under the 2020 ceasefire, Russia was to guarantee access, but the corridor became a recurring flashpoint. In December 2022, Azerbaijani protesters (and later state forces) blockaded the corridor, leading to a nine-month siege that caused severe shortages of food, medicine, and fuel in Nagorno-Karabakh. The geography of the corridor—a steep, winding road through a narrow valley—makes it extremely vulnerable to interdiction. The ability to control this lifeline gave Azerbaijan immense leverage.

Humanitarian and Civilian Impact

The geography of the region has directly shaped the humanitarian crises that have accompanied the conflict. The isolation of communities in high mountain valleys has meant that when conflict flares, access for aid agencies becomes extraordinarily difficult. During the war, civilians were often trapped in basements and bunkers with no safe route of evacuation. The terrain that protects combatants also imprisons non-combatants.

Mine contamination remains a persistent problem. The Nagorno-Karabakh region is one of the most heavily mined areas in the world, with uncleared minefields from the first war still present. The rough terrain makes demining incredibly slow and dangerous. Agricultural land, pastures, and even village streets are potential hazards. This has prevented the return of displaced populations and has killed or injured hundreds of civilians, including many in the post-2020 period even before the final exodus.

Infrastructure and Economic Isolation

Building and maintaining infrastructure in such difficult terrain is expensive and logistically challenging. During the decades of the de facto republic, the region suffered from chronic underinvestment and isolation. Roads were poor, power grids were fragile, and water systems were aging. The rugged geography exacerbated these problems: a single landslide or bombing could cut off a whole town. The region's economy was heavily dependent on agriculture, livestock, and limited mining, all constrained by the mountainous landscape. The inability to develop a diversified economy made the region reliant on support from Armenia and the diaspora.

Following the 2020 war and the 2023 events, the question of reconstruction and resettlement looms, but the geographical challenges remain. Azerbaijan has announced ambitious plans to rebuild infrastructure in the region, including new roads, airports, and power lines. The resettlement of the region by Azerbaijani IDPs from the previous conflict will require overcoming the same geographic constraints, with the added challenge of demining and rebuilding destroyed settlements. The mountain ranges that protected the Armenian population for decades will now present obstacles for the Azerbaijani resettlement effort.

International Involvement and the Geopolitical Dimension

The Nagorno-Karabakh conflict is not only a local dispute; it has been a theater for regional and global powers. Russia has historically played the role of mediator, enforcer, and interested party. Russian peacekeepers were stationed in the region after the 2020 ceasefire, but their presence failed to prevent the 2023 offensive. Turkey has been a steadfast ally of Azerbaijan, providing military training, arms, and diplomatic support. The OSCE Minsk Group, co-chaired by France, Russia, and the United States, mediated peace talks for decades but failed to produce a final settlement.

The geography of the conflict has broader geopolitical implications. The region sits at a crossroads between Europe and Asia, near major energy pipelines. The Baku-Tbilisi-Ceyhan oil pipeline and the Southern Gas Corridor are critical energy infrastructure routes that bypass Armenian territory. Control over the mountains that overlook these corridors is a matter of energy security for the region. Furthermore, the conflict has strained relations between Armenia and Russia, and has prompted Armenia to seek closer ties with the European Union and the United States. The shifting geopolitical alignments are a direct consequence of the failure to resolve the territorial dispute.

The negotiations were consistently deadlocked by the fundamental clash between territorial integrity and self-determination. The Minsk Group proposals included various formulas for autonomy, phased withdrawal of forces, and referendums, but no framework could bridge the gap. The 2020 war and the 2023 offensive have essentially ended the negotiation process by force of arms. Azerbaijan now controls the entire territory of the former NKAO and the surrounding districts. There is no longer a de facto Armenian statelet to negotiate about. The remaining issues include the rights and security of the Armenian population (which is now dispersed), border demarcation between Armenia and Azerbaijan, and the opening of transportation corridors.

The legal status of the region is effectively settled by the new territorial reality, but the human and political consequences are far from settled. The exodus of the Armenian population raises profound questions about ethnic cleansing, the protection of minorities, and the future of multi-ethnic societies in the Caucasus. The international community has largely failed to prevent or reverse the demographic change. The focus has shifted to normalizing relations between Armenia and Azerbaijan and ensuring stability along their shared border, which is still contested in places and runs through difficult mountain terrain.

Conclusion: A Landscape of Unresolved Consequences

The Nagorno-Karabakh conflict is a stark illustration of how geography, ethnicity, and geopolitics combine to create intractable disputes. The mountain ranges of the Lesser Caucasus provided a natural fortress for the Armenian population for centuries and for the de facto republic for three decades. However, technological change, shifting military strategies, and geopolitical isolation eventually allowed Azerbaijan to overcome those defensive advantages. The final outcome has been the complete territorial reintegration of the region into Azerbaijan, but at the cost of the departure of the entire Armenian population.

The dispute is no longer an active territorial conflict, but its consequences are still unfolding. The border between Armenia and Azerbaijan remains militarized, with periodic skirmishes. The issue of how to reintegrate the war-affected populations and rebuild the devastated region is immense. The mountain passes and valleys that once echoed with artillery fire may now see the sounds of bulldozers and construction crews, but the human legacy of displacement and loss will last for generations. The history of Nagorno-Karabakh is a cautionary tale about the power of geography to shape conflict, and the tragic failure of diplomacy to find a peaceful resolution.

The rugged mountains did not change, but the political map did. The future stability of the South Caucasus depends on whether both nations can finally move beyond the cycle of war and displacement, and build a peace that acknowledges the pains of the past without being trapped by them. For now, the empty villages and abandoned terraces stand as silent reminders of a community that once called these mountains home.

For those seeking further information, the Council on Foreign Relations maintains a comprehensive global conflict tracker. The BBC provides a detailed profile of the region. For in-depth analysis of the humanitarian impact, Human Rights Watch publishes extensive reporting on the region. The International Crisis Group offers ongoing analysis of the conflict dynamics.