The waters of the Manzanares river are very clear and do not resemble at all the Manzanares river in Madrid, made to seem even more narrow by its sumptuous bridge. It springs, like all the rivers of New Andalusia, from the llanos (plains) known as the plateaux of Jonoro, Amana and Guanipa. The construction of a dyke to irrigate the land has been several times proposed to the government, but without success for, despite the apparent sterility, the land is extremely productive wherever heat and humidity meet.