An enclave is a territory or country with boundaries that are completely within the boundaries of another country. Lesotho is a common example, as it is completely surrounded by South Africa. An exclave is a portion of a country that is separated geographically from the country's mainland. Gibraltar, located on Spain's coast, is an exclave of the United Kingdom. Kaliningrad is an exclave of Russia.
That would be 75% of Earth's atmosphere.
