Prague, Czech Republic
The Vltava river is 430.3 kilometres long and drains an area 28,090 square kilometres in size, over half of Bohemia and about a third of the Czech Republic’s entire territory. As it runs through Prague, the river is crossed by 18 bridges (including the Charles Bridge) and covers 31 kilometres within the city. The water from the river was used for drinking until 1912, when the Vinohrady Water Tower ceased pumping operation. It is, however, the source of drinking water in case of failures/repairs to the water supply from the Želivka and Kárané sources. The Podolí water processing plant is on standby for such cases with the long section of the river upstream of the Podolí plant under the stricter, second degree of pollution prevention regulations.