- seaA large body of salt water.
- SeatonA coastal village in Deviock parish, Cornwall, on a river of the same name (OS grid ref SX304544).
- SeafordA suburb of Melbourne, Victoria, Australia.
- SeacombeA neighbourhood and Mersey ferry terminal in Wallasey, Metropolitan Borough of Wirral, Merseyside, England (OS grid ref SJ3290).