In medieval times the diocese extended from the Aar, near Solothurn, to the northern end of the Valley of St. Imier, thence along the Doubs and the ridge of the Jura Mountains to where the Aubonne flows into Lake Geneva, and thence along the north of the lake to Villeneuve whence the boundary-line followed the watershed between Rhône and Aar to the Grimsel, and down the Aar to Attiswil.
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