Though most visitors to London think only of the River Thames, the city is a myriad of waterways.
Old maps show a skein of rivers and brooks that provided 'blue corridors' traversing the city for centuries, providing both sources of food and recreation.
But as London boomed, these waterways faded from consciousness – encased by walls, tu ed into polluted backwaters or simply covered over to run unseen beneath busy streets. (BBC)
(colombotimes.lk)