sentences:  In ancient times it was the extreme point of the short northwestern arm of Lago Maggiore, formed by glaciation.However repeated flooding of Maggiore’s tributary the Toce deposited sediment which gradually formed a stretch of land which cut off Mergozzo from the larger expanse of water, and from the Toce itself.Today the settlement of Fondotoce (a frazione of Verbania) stands on this alluvial plain.