Mass Effect: Ghosts
Feros is a habitable world in the Attican Beta cluster. Two-thirds of the habitable surface is covered with the ruins of crumbling Prothean megalopolis. In the millennia since the Prothean extinction, the ruins have been picked over by looters many times.
Feros was considered a poor prospect for colonization, as little open ground remains for agriculture. The only sizable fresh water sources are the poles, which are tapped by the decaying Prothean aqueduct system. The dead cities, while in good condition considering their antiquity, are of uncertain stability. Ground level is congested by a dozen meters of fallen debris, and the air is fouled by dust.
In 2178, the Human ExoGeni Corporation announced its intention to place a permanent colony on Feros, to thoroughly explore the ruins. The pioneer settlement was placed on the upper levels of the several intact skyscrapers, using the surviving Prothean aqueducts and rooftop hydroponics gardens to support the population.