| The Long Water | |
|---|---|
 The Long Water from the Italian Garden | |
  The Long Water | |
| Location | London, England |
| Coordinates | 51°30′27″N 0°10′28″W / 51.507378°N 0.174444°W |
| Type | Artificial lake |
| Primary inflows | Three boreholes from the upper chalk |
| Primary outflows | Storm Relief Sewer |
| Basin countries | England |
The Long Water is a recreational lake in Kensington Gardens, London, England, created in 1730 at the behest of Caroline of Ansbach. The Long Water refers to the long and narrow western half of the lake that is known as the Serpentine. Serpentine Bridge, which marks the boundary between Hyde Park and Kensington Gardens, also marks the Long Water's eastern boundary.
The Long Water and the Serpentine are generally considered to be part of one lake.