>>37622177The River Thames is 215 miles (346 km) long, and is split into two sections, tidal and non-tidal. The tidal part, which is affected by the North Sea’s tides, runs for 68 miles (109 km) from the mouth of the river to Teddington Lock in west London. And the non-tidal section is 147 miles (237 km) long from Teddigton Lock to the source of the river in the north of Kemble, a village in Gloucesterhire.
