“Cheonggyecheon is an 11 km long modern stream that runs through downtown Seoul.  The stream starts from Cheonggye Plaza, a popular cultural arts venue, and passes under a total of 22 bridges before flowing into the Hangang (River), with many attractions along its length.” (1)

[1]http://www.visitseoul.net/en/see/cheonggyecheon/cheonggyecheon.jhtml