The highest elevation (2000 ft.) is in the granitic highlands of Morvan, in the S.E., where other peaks range from 1300 to 1600 ft. The department belongs to the basin of the Seine, except a small district in the S.W. (Puisaye), which belongs to that of the Loire.
To the W. of the Yonne, in the Puisaye, are the sources of the Loing, another tributary of the Seine, and of its affluents, the Ouanne and the Lunain.
The Yonne is navigable throughout the department, and is connected with the Loire by the canal of Nivernais, which in turn is connected with that of Briare, which connects the Seine and the Loire.
To improve navigation, the water level was raised by means of dams and by storage reservoirs in the basin of the Yonne River.
The Old Town, situated on the right (eastern) bank of the Yonne River, is surrounded by shady boulevards and promenades built on the site of the old Roman walls.
The main river of the Paris Basin, the Seine, 485 miles (780 km) in length, is joined upstream on the left bank by its tributary the Yonne, on the right bank south of Paris by the Marne, and north of the city by the Oise.
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