The Lakeside Space is a temporary social construction in a limited ecosystem. Lake Llanquihue is a singular case: a lake with a glacial origin in a basin associated to two active volcanoes and both sharing only one natural drainage. It gathers different administrations and cities to its shores, heirs of a late German colonization in an extraordinary landscape. The inhabited territory presents diverse conflicts and in connection therewith, matrices of analysis are designed and temporal mapping of ecological, anthropological, economic and governance dimensions are elaborated. The results promote a cross model of social construction and sustainable land under the concept of the Lakeside Space.