Cengiz Topel Naval Air Station (), aka Topel Airport or formerly Cengiz Topel Air Base, is a Turkish Navy air station located east of İzmit in Kocaeli Province, Turkey. The airport is in joint use for military and civil. Restructured in 1976, it hosts the Turkish Naval Aviation Command with two flying units, the 301st Squadron of fixed-wing aircraft and the 351st Squadron of rotorcrafts. Cengiz Topel Naval Air Station is situated east of Köseköy neighborhood in İzmit and west of Lake Sapanca between the highway and the motorway .