A barrier refers to something that blocks or hinders progress or movement. In relation to migration, it often denotes physical obstacles that prevent easy passage from one place to another.
Related terms
Border control: Regulations and procedures at national borders designed to monitor and manage the movement of people.
Cultural barriers: Differences in language, customs, or traditions that can create challenges for migrants trying to adapt to a new location.
Legal barriers: Restrictions imposed by laws and regulations that can limit or control migration.