Enclave
The term exclave in human geography refers to a piece of land under the sovereignty of a country in the principal territory of which it is separated by one or more countries or seas. When this exclave or the entire principal territory is completely surrounded by another region or country, it also forms an enclave in that other region or country. Region C is an exclave of country B, as well as an enclave in country A which encircles it completely. Region C is an exclave of country B, but is not an enclave of any country. Exclaves may also exist at a lower level when an administrative subdivision of a country is located outside its parent division. As a general rule, enclaves are much more rare geographically than territorial exclaves. In some cases, two excluded parts of the same territory can not be qualified as one exclave of the other, none having the supremacy over the other.