In geography, what term describes a zone of transition between two distinct cultures or political entities, rather than a precisely defined linear boundary?

💡 Explanation:

A frontier refers to a zone of transition, often unsettled or vaguely defined, that lies between two distinct political or cultural regions. Unlike a boundary, which is a precisely defined line, a frontier is an area where control and influence are often contested or unclear. A buffer zone is a neutral area serving to separate hostile forces or nations. An enclave is a territory surrounded by another state. A demarcation line is a formal, precisely defined boundary line.