This work details the history and importance of one of Great Britain's grandest rivers, the River Thames. It includes information on the river's geography and its role in the founding of London. This is a fascinating read for anyone with an interest in the history of the river. The River Thames takes its name from the Middle English Temese, which is derived from the Celtic name for river. Originating at the Thames Head in Gloucestershire, it is the longest river in England, flowing a total length of 236 miles, out through the Thames Estuary and in to the North Sea. On its journey to open water it passes through the country's capital, London, where it is deep enough to be navigable for ships, thus allowing the city to become a major international trade port.