Terrain context

A mountain frontier that was an internal administrative line for seventy years and became an international border without anyone marking it.

The full length of the Armenia–Azerbaijan frontier, from the northern Tavush and Tovuz sections through the central highlands to the southern Syunik and Nakhchivan approaches.4 named chokepointsConfidence: ModerateStatus as of 2026-06Reviewed 2026-07-26

Mountain and upland throughout, with the boundary running along ridgelines, through valleys and in places directly between villages. Settlement sits in the valleys on both sides, often within sight of the line. In the south the belt narrows around Syunik, where the frontier, the Iranian border and the Nakhchivan exclave converge within a short distance — the geographic reason the corridor question is as sensitive as it is.

Lines through farmland and villages that were internal Soviet boundaries, are policed as frontiers, and are recognised as borders by almost nobody.

The boundary lines around Abkhazia in Georgia's north-west and around South Ossetia in the centre-north, together with the adjacent Georgian-controlled districts.4 named chokepointsConfidence: ModerateStatus as of 2026-06Reviewed 2026-07-26

Varied and, crucially, ordinary. The South Ossetian line runs largely through agricultural lowland and foothills north of Gori, across farmland, orchards and villages. The Abkhaz line follows the Enguri river for much of its length, which gives it a natural feature the other lacks. Neither line follows terrain that would have suggested a boundary: they follow Soviet-era internal administrative divisions that were never intended to separate anything.

High, broken, forested ground reached through a handful of valleys — terrain that made a small force defensible for thirty years and then did not.

The former Nagorno-Karabakh Autonomous Oblast and its immediate surroundings, between the Armenian highlands and the Azerbaijani lowlands.4 named chokepointsConfidence: ModerateStatus as of 2026-06Reviewed 2026-07-26

Mountain and upland forest, cut by deep valleys and rising sharply from the Kura–Aras lowlands to the east. Settlement is concentrated in the valleys and on a few upland plateaus; the higher ground is wooded and largely empty. The contrast with the ground to the east is abrupt — the transition from open agricultural lowland to broken forested upland happens over a short distance, which is the single most consequential geographic fact about the territory.