Cassini, officially known as the Cassinian Union, is a sovereign state located in southeastern Aphrodite Terra on planet Venus. Encompassing all of Dione Regio and much of Themis Regio, Cassini is a completely insular nation which shares a maritime border with Saigyo in the north. The area came under the administration of the European Space Agency during the late 1990s, with colonization taking place throughout the 2000s. Cassini declared its independence in 2008, establishing itself as a federation of the main European settlements.