Location from Mass Effect by BioWare
The krogan homeworld — scarred by nuclear fire, kept barely habitable by an orbital shroud, a landscape that explains everything about why krogan are the way they are.
Tuchanka died in nuclear firestorms when the krogan split the atom — they achieved a nuclear age and then used it on themselves first, because that's what nuclear ages look like. The Council installed a shroud at the L1 Lagrange point to manage albedo and keep temperatures survivable. The CDEM — the Council Demilitarization Enforcement Mission — orbits in battlestations to maintain it and will not attempt to extract citizens threatened by clan warfare. The krogan never really rebuilt. The genophage then the rebellions then the centuries of managed decline have left Tuchanka as a monument to a species that might have been different and wasn't. Every flat surface on the planet has something fighting something else on it. The clans that remain are gathered around Urdnot territory, which Wrex is slowly making into something that looks like hope.
A planet of bombed-out craters, radioactive rubble, ash plains, salt flats, and alkaline seas. The sky is orange-brown through the shroud. The architecture that remains is massive and built to take damage. Predators the size of vehicles hunt across salt flats. The Urdnot camp is organized around a fire pit large enough to suggest what 'feast' means to this species.
Also known as: Tuchanka, The Krogan Homeworld