London is rich in waterways. The River Thames is the city's lifeline, a tidal river flowing through its heart, central to history, transport, and recreation. Serpentine Lake in Hyde Park is a large artificial lake popular for boating and swimming. Regent's Canal, built in the early 19th century for freight, now serves leisure boating and scenic walks through Camden and Regent's Park. Greenwich Park Pond offers tranquil views and waterfowl. Hampstead Ponds on Hampstead Heath comprise three swimming ponds—men's, ladies', and mixed—beloved by locals year-round. These water bodies enhance London's ecology, leisure, and scenic beauty.