joint foreign settlement
Historical term for a foreign settlement in East Asia (especially in treaty ports) that was administered jointly by multiple foreign powers rather than by a single nation.
The Shanghai International Settlement was established in the latter half of the 19th century.
居留地 is a general term for a foreign settlement or concession, while 共同居留地 specifically refers to one administered jointly by multiple countries.
租界 is the more common term for a foreign concession in China, often used interchangeably with 居留地, but 共同居留地 emphasizes the joint administration aspect.
Compound of 共同 (joint, cooperative) and 居留地 (foreign settlement). The term arose in the context of 19th-century treaty ports in East Asia.