Tideway
![Teddington Weir marks the start of the Tideway.](/Images/godic/202502/16/Teddington_Lock_25508.jpg")
![A Fast Response Targa 31 boat of the Marine Support Unit of the Metropolitan Police](/Images/godic/202502/16/Police.boat.london.arp5508.jpg")
![RNLI E class lifeboat based at Chiswick Pier performing a rescue](/Images/godic/202502/16/RNLI_Chelsea_Pensioner5508.jpg")
![River traffic around Waterloo Pier in 2008](/Images/godic/202502/16/Waterloo_Pier_15508.jpg")
The Tideway is a name given to the part of the River Thames in England that is subject to tides. This stretch of water is downstream from Teddington Lock and is in its widest definition just under 160 kilometres (99 mi) long. The Tideway includes the Thames Estuary, the Thames Gateway and the Pool of London.