Politically, the Eiger belongs to the Bernese municipalities of Grindelwald and Lauterbrunnen. The Kleine Scheidegg (literally, the small parting corner) connects the Männlichen-Tschuggen range with the western ridge of the Eiger. The Eiger does not properly form part of the main chain of the Bernese Alps, which borders the canton of Valais and forms the watershed between the Rhine and the Rhône, but constitutes a huge limestone buttress, projecting from the crystalline basement of the Mönch across the Eigerjoch. Consequently, all sides of the Eiger feed finally the same river, namely the Lütschine.