Piz Pisoc, Summit in Sesvenna Range, Switzerland

Piz Pisoc is a 3,173 meter summit in the Sesvenna Range, positioned west of Pass Costainas in the Swiss Alps. This peak forms a distinct landmark in the eastern portion of Grisons and can be spotted from surrounding valleys.

Piz Pisoc appears as "Biz Bisogg" on the Atlas Tyrolensis maps of 1774, when it marked the border between Tirol and Graubünden because Tarasp was then a Tirolian exclave. Its east side later became part of the Swiss National Park, and around 1500 m a tunnel of the Engadiner Kraftwerke passes beneath the massif.

The name appears as "Biz Bisogg" on the 1774 Atlas Tyrolensis maps, when the peak marked the border between Tirol and Graubünden because Tarasp was then a Tirolian exclave. In Vallader Romansh the name is pronounced with the stress on the final syllable.

Visitors should come with solid mountaineering experience, as the ascent involves technical sections and demands reliable weather conditions. Summer offers the most favorable window for attempting the climb with stable mountain conditions.

The massif is crossed at about 1,500 m by a tunnel of the Engadiner Kraftwerke, and the park's lowest point, 1,382 m, lies at its foot on the Clemgia below Plan da Funtanas. In the 1774 Atlas Tyrolensis the peak appears as "Biz Bisogg", when it marked the border between Tirol and Graubünden.