Mardyke

The Mardyke is a small river, mainly in Thurrock, that flows into the River Thames at Purfleet, close to the Queen Elizabeth II Bridge. In part, it forms the boundary between the Essex hundreds of Barstable and Chafford. The river gives its name to the Mardyke Valley—a project aimed at increasing appreciation and usage of recreational land around the Mardyke.

The main source of the Mardyke is in Holden's Wood between Great Warley and Little Warley. It flows roughly 11 miles from the source to the Tideway of the Thames at Purfleet, close to the Queen Elizabeth II Bridge. There are two tributaries flowing south from Thorndon Country Park, in the grounds of Thorndon Hall. One of these flows south from Old Hall Pond. The pond has a sluice gate that could be opened to allow the water to flow over an artificial waterfall – the sort of water feature popular with landscape gardeners such as Lancelot "Capability" Brown who landscaped the grounds of Thorndon Hall in the 18th century, although the pond itself dates from the 13th century. Another tributary flows west from Dunton Plotlands section of the Langdon Nature Reserve in Langdon Hills and another flows east from Upminster.

Wikipedia