From Mohenjo-Daro’s Great Bath to a kilometer-long sea pool
A swimming pool is a structure built to hold water for swimming. In-ground or above ground, public or private, chlorine or salt—the form is ancient. Guinness ranks Chile’s San Alfonso del Mar pool more than a kilometer long; Dubai’s Deep Dive tank plunges sixty metres.
Pools may be dug into the ground from concrete, stone, metal, plastic, composite, or fiberglass, or freestand above ground, even aboard ships. Olympic-size lanes set one standard; custom shapes abound. Health clubs, hotels, schools, apartments, and warm-climate homes all host them. Water is typically chlorinated or salted, heated or not. Specialized tanks serve diving, therapy, lifeguard training, and astronaut practice.
The brick-lined “Great Bath” at Mohenjo-Daro in modern Pakistan, dug in the third millennium BC, measures about twelve by seven metres and is often called the first swimming pool. Greeks and Romans built palaestra pools; Gaius Maecenas likely had the first heated pool on Rome’s Esquiline Hill between 38 and 8 BC. Britain’s mid-nineteenth-century boom included six indoor London pools with diving boards by 1837; Maidstone Swimming Club, formed in 1844 after Medway drownings, is thought Britain’s oldest surviving club. Modern Olympics swimming from 1896 spread competitive pools; home pools surged in postwar America after Hollywood swim films such as Esther Williams’s Million Dollar Mermaid.
Records underline scale. San Alfonso del Mar in Algarrobo, Chile, finished in December 2006, is 1,013 metres long with an eight-hectare area and 3.5-metre maximum depth. Deep Dive Dubai earned Guinness deepest-pool status in 2021 at sixty metres, surpassing Italy’s Y-40 at 42.15 metres. Competition lengths commonly run twenty-five yards, twenty-five metres, or fifty metres; world records need recognised short- or long-course metric pools. An Olympic pool’s ten lanes at 2.5 metres each make it twenty-five metres wide.
Source: Swimming pool
