Fascinating and unusual beaches are revealed as the tide goes out and the water level is lowered in the River Thames as it passes through the city of London. The composition of these narrow stretches of tidal river foreshore, confined between embankments and revetments, varies from place to place, and maybe from tide to tide. At times, all is covered by soft sediments, while at others, the underlying clay and chalk with natural flint and stone pebbles can be seen. Most interesting of all is the accompanying debris that has been historically dumped through the ages. This is fertile ground for the licensed “mudlarkers” who search for valuables, curiosities and treasures. In the past, these items have included significant archaeological finds such as carved wooden figurative objects, and ceremonial stone mace and axe heads, often given as votive offerings to the river which was considered sacred. Many of these finds are displayed in the Museum of London. More likely finds would be fragments of pottery, pieces of clay pipes, and food remains like oyster shells and animal bones.