River Clyde vs. Thames: Thames Is Longer

Length Comparison: Thames > Clyde

The River Thames (England) is longer than the River Clyde (Scotland).

• River Thames: ~346 km (215 mi) — source at Thames Head (Cotswolds) → North Sea.
• River Clyde: ~170 km (106 mi) — source at Lowther Hills → Firth of Clyde.

Key Facts

• Thames: Longest river entirely in England. Tidal to Teddington Lock (London).
• Clyde: Scotland's 3rd longest (after Tay, Spey). Historic shipbuilding (Glasgow).
• Both heavily engineered; both central to industrial history.