Gignoux Lake (2329 m above sea level), also known as the Seven Colors Lake, is located in France in the Provence-Alps-French Riviera region at the border with the Susa Valley (Piedmont) territory. The lake is in the French department of the Upper Alps, to the east of Mount Chenaillet (2650 m a.s.l.) and to the north of the Cerveyrette Valley.
The lake covers an area of about 2 hectares. The Cima Saurel (2449 m a.s.l.) and the Mount Gimont (2648 m a.s.l.) form the northern side of the lake and are part of the border with Italy. The lake is set in an arid landscape with a view of Cervières (1620 m a.s.l.), the Chaberton (3 131 m a.s.l.) and the Fonts Valley.
Gignoux Lake is located in a habitat formed by scree and moraine. With basalt and gabbro outlining an oceanic crust, a sign of a deep (3,000 m) and ancient ocean (150 million years ago): the Ligurian Tethys also called the Piedmont-Liguria Ocean (a paleo-ocean).
The site has 14 important plant species. Among these, 4 are protected nationally and 7 only in the Provence-Alps-French Riviera region:
Among mammals, the most present species is the deer. Among nesting bird species, there are the common quail, the Ortolan bunting, the rock partridge and the black grouse.