Kostromskaya (Russian: Костромска́я) is a rural locality (a stanitsa) in Mostovsky District of Krasnodar Krai, Russia, located at the footsteps of the Caucasus Mountains on the Psefir River (Fars' tributary, Kuban basin), 15 kilometers (9.3 mi) southwest of the town of Labinsk. With a population estimated in the hundreds, it is very agrarian and rural in nature and has many mulberry trees. The roads in the village are mostly dirt or rocky. The landscape is very mountainous.