Last Glacial Maximum refugia
Last Glacial Maximum refugia were places (refugia) in which humans and other species survived during the Last Glacial Period, around 25,000 to 18,000 years ago. Glacial refugia are areas where climate changes were not as severe, and where species could recolonize after deglaciation.
Source: Wikipedia — Last Glacial Maximum refugia (CC BY-SA 4.0)