enclave

enclave
/ˈenkleɪv; `ɛnklev/ n
small territory of one state surrounded by that of another 飞地（被他国领土包围的一块领土）
    British enclaves in Africa 非洲的英国飞地
    (fig 比喻) Switzerland was an enclave of peace in war-torn Europe. 在饱经战争磨难的欧洲, 瑞士是和平的世外桃源.

牛津英汉双解词典