Seaport (pop., 2000: 3,505), western Alaska, U.S., on the southern side of the Seward Peninsula .
Founded as a mining camp called Anvil City after the discovery of gold at nearby Anvil Creek in 1898, it became a centre of the Alaskan gold rush of 1899–1903. Its population, estimated at 20,000 in 1900, had dwindled to 852 by 1920. Gold mining remained the chief occupation until the dredge fields were closed in 1962. The finish line for the Iditarod trail sled race, it also serves as a supply centre for northwestern Alaska.