Cetacean living quarters
were areas of habitable volume suitable for cetaceans
on board starships
or other spaceships
On Federation Galaxy-class starships, cetacean living quarters were located on decks 13 and 14 of the primary hull. The quarters were connected to the cetacean navigation lab and had their own dedicated cetacean lifeboats. They were accessible by non-aquatic personnel via wet/dry access locks opposite cetacean ops on deck 13.
The quarters were large enough to be inhabited by two Takaya's whales, seven smaller whales and up to 44 dolphins. (TNG reference: Star Trek: The Next Generation USS Enterprise NCC-1701-D Blueprints)
In 2368, Geordi La Forge took the Ferengi Par Lenor to see the dolphins. (TNG episode: "The Perfect Mate")