Akdamar Island , also known as Aghtamar ( ) or Akhtamar , is the second largest of the four islands in Lake Van, in eastern Turkey. About 0.7 km² in size, it is situated about 3 km from the shoreline. At the western end of the island a hard, grey, limestone cliff rises 80 m above the lake's level (1,912 m above sea level). The island declines to the east to a level site where a spring provides ample water. It is home to the 10th century Armenian Holy Cross Cathedral, which was the seat of the Armenian Apostolic Catholicosate of Aghtamar from 1116 to 1895.

Akdamar Island , also known as Aghtamar ( ) or Akhtamar , is the second largest of the four islands in Lake Van, in eastern Turkey. About 0.7 km² in size, it is situated about 3 km from the shoreline. At the western end of the island a hard, grey, limestone cliff rises 80 m above the lake's level (1,912 m above sea level). The island declines to the east to a level site where a spring provides ample water. It is home to the 10th century Armenian Holy Cross Cathedral, which was the seat of the Armenian Apostolic Catholicosate of Aghtamar from 1116 to 1895.