By sea there is ferry transport, both local and international, including from Liverpool to Ireland and the Isle of Man, and Hull to the Netherlands and Belgium. There are around of navigable waterways in England, half of which is owned by the Canal & River Trust, however, water transport is very limited. The River Thames is the major waterway in England, with imports and exports focused at the Port of Tilbury in the Thames Estuary, one of the United Kingdom's three major ports.