The Alpine Divide is defined for much of its distance by the watershed between the drainage basin of the Po in Italy on one side, with the other side of the divide being formed by the Rhone, the Rhine and the Danube. Further east, the watershed is between the Adige and the Danube, before heading into Austria and draining on both sides into the Danube. For much of its distance the watershed lies on or close to the Italian border, although there are numerous deviations, notably, the Swiss canton of Ticino which lies south of the range in the Po river basin.