The entrance to the port of Trouville-sur-Mer is marked by two lights carried by dolphins i.e stilts (wooden posts, steel tubes, or cement blocks). They are anchored in the bottom of the channel at the end of two booms (wharf quays made up of aprons also supported by pilings). The red light of the East boom is placed on a metal turret from 1860, rebuilt identically after its destruction during the Second World War. Some 36 ft (11 m) above sea level, the green light on the West boom has a range of 9 nautical miles.