 It and the Lauca River are shared with Bolivia, as well as the Lluta River.In the center-north of the country, the number of rivers that form valleys of agricultural importance increases.Noteworthy are the Elqui with 75 km long, 142 km Aconcagua, Maipo with 250 km and its tributary, the Mapocho with 110 km, and Maule with 240 km.