Manzanares River

Many of you probably don't know, but Madrid as a river!... Yes!... A river!... It's name is Manzanares, it runs on the south part of the city, and is an affluent of the Jarama river that at it's time is an affluent of the more know Tagus river, the largest of Iberian peninsula, the one that pases throw some beautiful cities as Toledo or Lisbon.
At this moment the area around of the Manzanares river, is a big (long) "terrain vague" waiting for the "super" park that politicians have promised, before it was an high-way (called M-30, now its buried, a big tunnel 14 or 16 km long, even if you don't see it is there)...