Foreshore of the River Thames
The foreshore of the River Thames in London, England, is the area of the riverbed revealed at low tide, and includes sections known as Tower Beach, Bermondsey Beach, and Folly House Beach, in Canary Wharf. These are tidal beaches that are covered by the water of the river at high tide.
Source: Wikipedia — Foreshore of the River Thames (CC BY-SA 4.0)