The Lepontic tectonic domain is situated between the Helvetic and Penninic units in the internal part of the Central Alps. It is characterized by the presence of a structural and metamorphic dome (Lepontine Dome). Most of these units are derived from the most distal part of the thinned European margin.

Western culmination of the Lepontic domain, situated between the Simplon Fault and the «Maggia Synformal Zone».