Cossack, formerly known as Tien Tsin, is an historic ghost town located 1,480 km (920 mi) north of Perth and 15 km (9.3 mi) from Roebourne in the Pilbara region of Western Australia. The nearest town to Cossack, which is located on Butcher Inlet (aka Butcher's Inlet) at the mouth of the Harding River, is Wickham. The former Tien Tsin Harbour is now known as Port Walcott.