Sadarak is a rayon and the westernmost part of Azerbaijan in the Nakhchivan Autonomous Republic. It was split from the Ilyich rayon in 1990. It has an exclave in Armenia - Karki - which has been under Armenian control since May 1992 when it was captured during the Nagorno-Karabakh War. Sadarak covers 163,74 km2, located in the north-west of Nakchivan Autonomous Republic and has three villages. The capital of Sadarak is Heydarabad. The distance from Sadarak to Yerevan is 60 km.
Sadarak is the only Azerbaijani district bordering on Turkey. In the years of blockade Nakhchivan's only "road of life" passed through Sadarak, which is considered Nakhchivan Autonomous Republic's fortress. Mount Ararat is visible from here.
Wikipedia https://en.wikipedia.org/wiki/Sadarak_District
Coordinates 39°43'24.981" N 44°50'53.864" E