The Thames Estuary is the area where the River Thames meets the North Sea in southeastern England. It stretches from the town of Gravesend to the North Sea, encompassing various towns and ports, including Southend-on-Sea and Tilbury. The estuary is characterized by its tidal nature, which influences the surrounding environment and ecosystems. This region is significant for shipping and trade, serving as a major gateway for goods entering and leaving London. The estuary also supports diverse wildlife, including various bird species and marine life, making it an important area for conservation efforts.