sentences:  When looking at a map of the Province of Madrid, it can be seen that it is almost an equilateral triangle, in whose center would be the city.First, by the western side, the region borders the "Sistema Central" (the Guadarrama mountain range), the southern border features a protrusion following the Tagus River in order to include the royal site of Aranjuez in the region; the eastern edge of the triangle comes from the rupture of the fluvial river basins.The region is located in the basin of the Tagus River.