Fremantle is a port city in Western Australia, located 19 kilometres (12 mi) southwest of Perth, the state capital, at the mouth of the Swan River on Australia's western coast. It was the first settlement of the Swan River Colonists in 1829. It was declared a city in 1929, and has a population of approximately 26,000. The city is named after Charles Fremantle, the English naval officer who had pronounced possession of Western Australia and who established the camp at the site. The city contains well preserved buildings and other heritage sites. The Western Australian vernacular diminutive for Fremantle is "Freo".