Portal:Rivers/Did you know/6

... that 25 million tourists—more than twice the population of the entire state—visited the Mandakini River in Uttarakhand in 2011?
... that for three years, an illegal gold-mining settlement on the Amur river went on to host high-class hotels, have public healthcare, and even have a casino?
... that Boom Hall was named after a defensive structure on the River Foyle that was breached during the 1689 Siege of Derry?