River Thames Thames Estuary), the river is subject to tidal activity from the North Sea. Before the lock was installed, the river was tidal as far as Staines, about upstream. London, capital of Roman Britain, was established on two hills, now known as Cornhill and Ludgate Hill. These provided a firm base for a trading centre at the lowest possible point on the Thames. A river crossing was built at the site of London Bridge. London Bridge is now used as the basis for published tide tables giving the times of high tide. High tide reaches Putney about 30 minutes later than
River Thames whale survive for much longer. As the barge rushed along the Thames towards the sea, news channels provided non-stop coverage of the journey. It reached the Thames Barrier at approximately 5:00 pm. Later, despite the darkness, it was reported that crowds were lining the Queen Elizabeth II Bridge to catch a glimpse of the barge. As each hour passed, there was growing concern for the whale's health, and she was said to be taking a turn for the worse due to being out of the water, as well as slowly being crushed by her own body weight. Plans to release the