hostile terrain

Translations
враждебная местность
The explorers were not prepared for the hostile terrain they encountered.
Исследователи не были готовы к враждебной местности, с которой они столкнулись.
Definitions
Hostile terrain refers to land or environment that is difficult, dangerous, or unwelcoming for human activity, often characterized by extreme weather conditions, difficult geography, or the presence of threats such as wildlife or enemy forces.
Words
hostile

adjective
враждебный
terrain

noun
местность