Many Scottish coastal resorts used to have outdoor pools which were filled at high tide. Few are still in use as holidaymakers are less hardy than they were in the 1960s. For another view, see NO5017 : St Andrews sea swimming pool
This 'Step Rock' salt water swimming pool predates the adjacent Aquarium, having been built as a public amenity by the Town Council in 1903. [qv 'Hidden St Andrews', McMullan 2014]