River Thames Thames Estuary), the river is subject to tidal activity from the North Sea. Before the lock was installed, the river was tidal as far as Staines, about upstream. London, capital of Roman Britain, was established on two hills, now known as Cornhill and Ludgate Hill. These provided a firm base for a trading centre at the lowest possible point on the Thames. A river crossing was built at the site of London Bridge. London Bridge is now used as the basis for published tide tables giving the times of high tide. High tide reaches Putney about 30 minutes later than
Sunbury-on-Thames to complete and enlisted the help of over 140 volunteers and artists. Queen Elizabeth II visited the Embroidery in 2001 and the gallery built for it in 2006. This residential island of Sunbury is one of the longest on the River Thames and is divided into two sections by a storm weir. It is connected by a wide footbridge. The main weir, maintained and owned by the Environment Agency, connects the downstream end of the island to Sunbury Lock Ait, which is almost uninhabited, and is within the modern parish bounds of Walton and has the Middle Thames Yachting and