Longman Dictionary of Contemporary English
rock pool
noun
EXAMPLES FROM CORPUS
▪ A bottle swept up to his feet and rolled in a rock pool.
▪ Others crouched over rock pool, teasing out sea anemones.
Wikipedia
Rock Pool
The Rock Pool is an open air, sea pool located in Newcastle, County Down, Northern Ireland. It was opened on in 1933 and is the last of its kind still in operation in Ireland. The pool is owned and operated by Newry, Mourne and Down District Council (Down District Council prior to the local government reform coming into effect on 1 April 2015).