Language island
A language island is an exclave of a language that is surrounded by one or more different languages.
Examples of language islands:
File:BelgiumBrussels.png|The predominantly French-speaking enclave of Brussels showed as slashed grey and red surrounded by a Dutch-speaking grey area
File:Romania harta etnica 2011.PNG|Language islands in Romania
File:Germany sorbian region.png|Sorbian language area in Germany