 Topographically, the three most important summits of Switzerland are those of Monte Rosa (most elevated), the Finsteraarhorn (most prominent) and Piz Bernina (most isolated).The Union Internationale des Associations d'Alpinisme defines a summit in the Alps as independent, if the connecting ridge between it and a higher summit drops at least 30 m (a prominence/drop of 30 m, with the lowest point referred to as the "key col").There are over 4400 such summits exceeding 2000 m in Switzerland.