The Lake of Orient or Seine Reservoir Lake is a lake in northeastern France, located in the Aube department of the Grand Est region. With a surface area of 23 km2 and a normal capacity of 205 km3, it is the third-largest artificial lake in mainland France, after Lake Der-Chantecoq and Lake Serre-Ponçon, and ahead of Lake Sainte-Croix.,
It is one of the four great Seine lakes, designed to protect Paris from flooding. Built as a diversion from the Seine in the 1950s and 1960s, it was first put into service in 1966. Along with the neighboring Amance and Temple lakes, it is part of the Orient Forest Regional Natural Park, from which it takes its name.
