Heydarabad is a settlement and the capital of the Sadarak District of the Nakhchivan Autonomous Republic of Azerbaijan. It borders Armenia and before the First Nagorno-Karabakh War had road and rail connections with the Armenian village of Yeraskh on the other side of the border. It has a population of 2,000 as of 2013. It is the westernmost settlement of Az…Heydarabad is a settlement and the capital of the Sadarak District of the Nakhchivan Autonomous Republic of Azerbaijan. It borders Armenia and before the First Nagorno-Karabakh War had road and rail connections with the Armenian village of Yeraskh on the other side of the border. It has a population of 2,000 as of 2013. It is the westernmost settlement of Azerbaijan.