The River Thames reaches a depth of about 37 feet at its deepest point. The Thames stretches some 215 miles from source to sea and is the longest river in England.
The depth of the Thames varies considerably at different points along its course. The river has a depth of only about 5.9 feet at the London Bridge. According to Thames River Trust, the river features 190 small islands that are formed by dividing streams, silt and sedimentary deposits that occur in 18 catchments. The River Thames is fed by 38 main tributaries that include rivers, brooks and several underground streams.