By studying the different territories to which the inhabitants of Valdilago and Alfina had the feeling of belonging and the resulting games of cospatiality, this article takes a broader look at the functioning of the territories and their limits in the 10th and 12th centuries. By paying attention to the dialectical game that can exist between territories recognized de iure and those whose existence results from factual practices, it offers a new way of understanding the profound social reconfigurations of this period.