St. Peter’s Island and a maximum width of 800 metres . Its highest point is 474 metres above sea level or 45 metres above lake level . It was formed in the last Ice Age , when the Rhône Glacier reached as far as the Jura mountains. It is a promontory of the Jolimont, above Cerlier. Politically the island is split between the municipalities of Erlach and Twann-Tüscherz, the largest part belonging to the latter municipality.
In the late nineteenth century following the engineering works of the Jura water correction, the water-level of the three lakes of the Seeland have dropped enough to clear the until-then hidden isthmus, linking Cerlier to St. Peter’s Island, which has ever since become a peninsula, although separated from the shore by a canal.
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