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In British English, a lido (// LEE-doh, // LY-doh) is a public outdoor swimming pool and surrounding facilities, or part of a beach where people can swim, lie in the sun, or participate in water sports. On a cruise ship or ocean liner, the lido deck features outdoor pools and related facilities.
Lido, an Italian word for "beach", forms part of the place names of several Italian seaside towns known for their beaches, such as Lido di Venezia, the barrier beach enclosing the Venetian Lagoon. The term may have found its way into English via English visitors returning from the Lido di Venezia, where sea-bathing took place from the late-19th century.