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The [[River Thames]] is, at 215 miles (346 km) from source to sea, the longest river that runs wholly in [[England]] (the [[Severn]], which rises in [[Wales]], is longer)<ref>''Whittaker's Almanack 2001'' p108</ref>. It rises near Cricklade in [[Gloucestershire]] and runs through [[Oxford]], [[Reading]], [[Windsor]] and [[London]] before entering the [[North Sea]]. The river is tidal as far as Teddington Lock, in west [[London]]. A number of [[canals]] were built in the eighteenth and nineteenth centuries connecting the Thames to the inland waterways system; most notable are the Kennett & Avon Canal, connecting the Thames to Bristol and the west coast, and the Grand Junction Canal (since 1929 the [[Grand Union Canal]]) which runs from London to [[Northamptonshire]] and links London to the canal system of the Midlands and northern England.

The [[River Thames]] is, at 215 miles (346 km) from source to sea, the longest river that runs wholly in [[England]] (the [[Severn]], which rises in [[Wales]], is longer)<ref>''Whittaker's Almanack 2001'' p108</ref>. It rises near Cricklade in [[Gloucestershire]] and runs through [[Oxford]], [[Reading]], [[Windsor]] and [[London]] before entering the [[North Sea]]. The river is tidal as far as Teddington Lock, in west [[London]]. A number of [[canals]] were built in the eighteenth and nineteenth centuries connecting the Thames to the inland waterways system; most notable are the Kennett & Avon Canal, connecting the Thames to Bristol and the west coast, and the Grand Junction Canal (since 1929 the [[Grand Union Canal]]) which runs from London to [[Northamptonshire]] and links London to the canal system of the Midlands and northern England.