Mozrov Cave, Natural cave in Vayots Dzor Region, Armenia.

Mozrov Cave is a hydrothermal karst cave about 300 metres long (170 metres in a straight line) and 130 metres deep, the deepest in Armenia. Its walls and vaults carry a 10-centimetre crust of calcite crystals, partly overlaid by later carbonate flowstone, with stalactites and helictoids. The multi-hall structure includes chambers named Waterfalls, Abyss, Firs, Dolls, Cacti, White Corals and Red Lava Rocks.

In autumn 1980, road builders blasting limestone for the Arpi-Mozrov road opened a shaft into the cave. Authorities of the Yeghegnadzor district invited a team of speleologists from Yerevan, who began surveying the next day and found linked halls and passages. The cave is listed as a local monument in the Arpi village heritage register.

The first explorers named the cave's halls after what they saw inside: Waterfalls, Abyss, Firs, Dolls, Cacti, White Corals and Red Lava Rocks. In the Dolls Hall, a rock relief resembles a stage, and the researchers once staged a small puppet show in front of it, which gave the hall its name.

A visit requires careful preparation and warm clothing, as interior temperatures stay low year-round. The unpaved paths leading to the entrance are slippery, so sturdy footwear and a flashlight or headlamp are essential.

The walls and vaults are coated with a 10 cm crust of calcite crystals, over which younger carbonate flows have settled in places. The first explorers named the halls after what they saw inside, among them the Waterfalls, the Abyss, the Firs, the Dolls, the Cacti, the White Corals and the Red Lava Rocks halls.