Kachaghakaberd (Armenian: Կաչաղակաբերդ, Azerbaijani: Qaxaç qalası) is a mountain-top fortress located between the villages of Kolatak and Khndzristan, in Khojaly District of Azerbaijan.

Kachaghakaberd is translated from Armenian as magpie's fortress, a combination of the words կաչաղաք (kachaghak, designating the bird magpie) and բերդ (berd, meaning fortress).

[2][3] The fortress was an important fortification of the medieval Armenian Principality of Khachen that thrived in the High Middle Ages,[4] and is located at a height of more than 1700 meters, surrounded by vertical limestone cliffs with the heights of 50–60 meters, has a hard-to-reach entrance from the southern side of the fortress.

Many rooms, secret passages cut into the cliffs, and special loopholes for throwing stones at enemies are inside its territory.

[3] The water supply problem was solved by a unique method: two rock-cut reservoirs to store rain and melt-water are in the center of the fortress.