Hanoi is sometimes called the "City of Lakes", a nod to the numerous bodies of water spread throughout the capital. The largest of these lakes is the grand West Lake (
Tay Ho), which spans hundreds of hectares and is believed to have been created when the nearby Red River changed courses many many centuries ago.
Once a place for local residents to gather and swim, these days the lake is suffering from the effects of heavy pollution, a result of unchecked construction and industrial waste.