Kalgoorlie is a city in the Goldfields–Esperance region of Western Australia, located 595 km east-northeast of Perth at the end of the Gr…Kalgoorlie is a city in the Goldfields–Esperance region of Western Australia, located 595 km east-northeast of Perth at the end of the Great Eastern Highway. It is sometimes referred to as Kalgoorlie–Boulder, as the surrounding urban area includes the historic townsite of Boulder and the local government area is the City of Kalgoorlie–Boulder.