seashore:Coastland adjacent to the sea. Literally the land washed by the sea between high and low tides, but in extended use describes entire administrative areas near the seafront. ——AAT-台湾

seashore:The coast of the sea, or the land lying adjacent to the sea; also, in more restricted sense, the ground actually washed by the sea at high tides (usually, covered with sand or shingle).——Oxford English Dictionary  @en