Dead Valley is a region in S.T.A.L.K.E.R. 2: Heart of Chornobyl.
Background
The way to the Generators is blocked by the forbidding Dead Valley, a desolate expanse haunted by phantoms, constantly shrouded in an enduring grayness. The landscape is strewn with the remnants of destroyed equipment and the corpses of those who have dared to traverse it. Venturing here means signing your own death warrant.