The Thames’s contents shift with every tide and the foreshore can change overnight, but generally you will find the most where the river has been busiest. Look at old maps; note the river stairs ...

There are 45 non-tidal locks along the River Thames, including Henley's A trade union has said River Thames lock and weir keepers are set to be balloted for industrial action over safety concerns.

A passage of text on the map stated that “the tidal Thames is not safe to swim in”, and it instead suggests Londoners enjoy locations like Hampstead Ponds, the Serpentine in Hyde Park ...