75 bridges cross over the non-tidal Thames
29 bridges cross over the tidal Thames
There is a 23ft (7m) difference between low and high tide at London Bridge
The non-tidal part of the Thames from the source to Teddington stretches for 237 km (147 miles) and falls some 104.2 metres (342 feet)
It is estimated that the river carries some 300,000 tonnes of sediment a year
More than 100 fish species have been recorded in the river estuary
Main tributaries
Leach (30 km) joins the Thames near Lechlade, Gloucestershire
Churn (37 km) joins the Thames at Cricklade, Wiltshire
Coln (52 km) joins the Thames at Inglesham, Wiltshire
Windrush (48 km) joins the Thames near Standlake, Oxfordshire
Kennet (77 km) joins the Thames at Reading, Berkshire
Evenlode (68 km) joins the Thames near Bladdon, Oxfordshire
Ock (37 km) joins the Thames at Abingdon, Oxfordshire
Loddon (32 km) joins the Thames at Wargrave, Berkshire