The region of Corsica and two other departments have formed a single territorial collectivity since their merger in 2018 .
The two departments , and the region of Corsisa , merged again into a single territorial collectivity in 2018.After being ruled by the Republic of Genoa since 1284 , Corsica was briefly an independent Corsican Republic from 1755 until it was officially ceded by the Republic of Genoa to Louis XV as part of a pledge for debts in 1768 .