According to the Oxfam report, more than half of Peru's rivers are extremely polluted in the North the Chillón, Yauli and Mantaro in the central region; and the Chili River in the South.
Chillon was considered for purchase by the Canton of Vaud in 1998 and was briefly opened for public tours, with the intention of making it into a museum.
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The Chablais and Chillon ensembles were not considered part of Fortress Saint-Maurice proper, but were important advance works to delay and weaken an attacker before they reached the Saint-Maurice stopping line, or fort d'arrêt.
The extent of the area designated as Fortress Saint-Maurice is not clearly defined, but according to the Association Fort de Litroz, the Saint-Maurice sector comprises the Rhône narrows from just north of Saint-Maurice to Martigny, excluding Chillon and Champillon, as well as the fortifications of the lateral valleys.
Some estimates are that the language was spoken on the coast as far south as the river Chillón (Carabayllo).
Built by the Consortium des Viaducs de Chillon between 1966 and 1969, it takes its name from the Château de Chillon which lies downhill on the shores of Lac Léman.