Cession

The act of cession is the transfer of property to another entity (person, country, etc.).  In international law, it commonly refers to land transferred by a treaty. It is different from annexation, where property is taken by force. Cession is voluntary or is supposed to be.

Retrocession

Retrocession is to return something (e.g., land) that was ceded.

Related pages
 Border dispute

Category:International law