mass migration

Translations
массовая миграция
The war led to a mass migration of people seeking safety.
Война привела к массовой миграции людей, ищущих безопасность.
Definitions
Mass migration refers to the large-scale movement of people from one geographic area to another, often driven by factors such as economic opportunity, conflict, environmental changes, or social conditions. This phenomenon can involve individuals or groups relocating within a country or across international borders.
Words
mass

adjective
массовая
migration

noun
миграция