A swimming pool was a container filled with water used for swimming.
The Doctor's TARDIS had a swimming pool. (TV: The Invasion of Time, Journey to the Centre of the TARDIS)
Jack Harkness used the swimming pool at Pontyvale Golf Course to electrocute a Craktor. (COMIC: Ma and Par)
The top floor of Paradise Towers had a swimming pool, video surveillance of which was forbidden by express command of the Great Architect. (TV: Paradise Towers)
The leisure planet Abydos had non-gravity swimming pools. (TV: The Leisure Hive)
Dark Space 8 had a swimming pool. Melanie Bush and Nicky Newman used it during their visit there. (AUDIO: Bang-Bang-a-Boom!)
Rose Tyler sarcastically noted that Sanctuary Base 6 didn't have a swimming pool when Danny Bartock began listing viruses capable of killing Ood that they didn't have at their disposal. (TV: The Satan Pit)
River Song ditched a family holiday in her grandfather's caravan to enjoy being waited on at a poolside by a buff, two-headed alien. (COMIC: Summer Wholiday)