Eiger's water is connected through the Weisse Lütschine (the white one) in the Lauterbrunnen Valley on the west side (southwestern face of the Eiger), and through the Schwarze Lütschine (the black one) running through Grindelwald (northwestern face), which meet each other in Zweilütschinen (lit.: the two Lütschinen) where they form the proper Lütschine. The east face is covered by the glacier called Ischmeer, (Bernese German for Ice Sea), which forms one upper part of the fast-retreating Lower Grindelwald Glacier. These glaciers' water forms a short creek, which is also confusingly called the Weisse Lütschine, but enters the black one already in Grindelwald together with the water from the Upper Grindelwald Glacier. Therefore, all the water running down the Eiger converges at the northern foot of the Männlichen () in Zweilütschinen (), about northwest of the summit, where the Lütschine begins its northern course to Lake Brienz and the Aare ().