The Great Float is a body of water on the Wirral Peninsula, England, formed from the natural tidal inlet, the Wallasey Pool. It is split into two large docks, East Float and West Float, both part of the Birkenhead Docks complex. The docks run approximately 2 miles (3 km) inland from the River Mersey, dividing the towns of Birkenhead and Wallasey. The Great Float consists of 110 acres (45 ha) of water and more than 4 miles (6 km) of quays.