The Johor River (Malay: Sungai Johor) is the main river in the Malaysian state of Johor. The river is 122.7 km long with a catchment of 2,636 km²[1] and flows in a roughly north-south direction, originating from Mount Gemuruh and then empties into the Strait of Johor. Its major tributaries are Sayong, Linggiu, Tiram and Lebam Rivers.