an extensive landlocked anchorage off the N coast of Scotland, in the Orkney Islands: major British naval base in both World Wars. Length: about 24 km (15 miles). Width: 13 km (8 miles)
Scapa Flow in American English
(ˈskæpə)
sea basin in the Orkney Islands, off N Scotland: British naval base: c. 50 sq mi (129 sq km)