The Tiber River at Rome flows from Monte Fumaiolo in the Tuscan-Romagnol Apennine from northeast to southwest, projecting into the Tyrrhenian Sea at right angles to the shore. The upper Tiber, however, flows from northwest to southeast, gradually turning through one right angle clockwise. The northern Tiber valley is deep and separates the Apennines on the left bank from a lesser range, the Tuscan Anti- or Sub-Apennines on its right.