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7 and 44 locks
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There are 20 bridges across the river Thames in London which can carry road traffic plus as many more bridges which are only for rail traffic or pedestrians.
There are over 200 bridges and tunnels to cross the river Thames. Tower Bridge, London Bridge and Westminster Bridge are probably the best known.
Incomplete question - does not say which river
You can walk, cycle, use a bus or drive. Ferry boat.
The river Thames has many bridges crossing it - 25 in London alone.
Yes, there are several bridges over the Yukon River. The most notable is the Yukon River Bridge near Dawson City, which connects the Klondike Highway across the river. Additionally, there are bridges in other locations, such as the bridge at Fort Yukon, accommodating vehicular traffic. However, many parts of the river remain unbridged, requiring alternative transportation methods like ferries.
There are many river in Wales and it might be a matter of opinion which were the 'main' ones. However two rivers which begin in Wales and flow into England are, or were, of major importance. These are the River Severn in Mid/South Wales and the River Dee in North Wales. For more information about Welsh rivers see the related link below.
There are 107 bridges across the Thames - to many to name here
None