The Great Kyz Kala is a large ruined fortress in the ancient city of Merv, now in Turkmenistan.

[1] The fortress belongs to the köshk or kushk type: an earthen building built on a raised platform, with exterior wall formed of large vertical engaged columns (a series of octagonal half-columns) having the aspect of large corrugations.

[2][3] These fortresses are equipped with internal palatial rooms, often decorated.

[2] It occupied an area of 1,569.84 square metres (16,897.6 sq ft).

[2][6] The Great Kyz Kala was an elite palatial suburban residence, perhaps meant for the use of the governor of Merv.