Selangor is one of the 13 states of Malaysia. It is on the west coast of Peninsular Malaysia and is bordered by Perak to the north, Pahang to the east, Negeri Sembilan to the south and the Strait of Malacca to the west. It completely surrounds the federal territories of Kuala Lumpur and Putrajaya. The origin of the name Selangor is lost in history, although some sources claim the name to have come from the Malay word selangau, 'a large fly' (Musca vicina), most probably due to the abundance of flies in the marshes along the Selangor River in the state's north-west. Another more plausible theory claims the state's name is derived from the term Selang Ur meaning "land of the straits" (ur means "land" in Sanskrit, selang means "straits" in the Malay language).