Northern Catalonia (Catalan: Catalunya Nord [kətəˈɫuɲə ˈnɔrt], French: Catalogne Nord) refers to the territory ceded to France by Spain through the signing of the Treaty of the Pyrenees in 1659. The area corresponds approximately to the modern French département of the Pyrénées-Orientales.
The equivalent term in French, Catalogne Nord, is used nowadays, although less often than the more politically neutral Roussillon (in reference to the pre-Revolutionary province). Sometimes French Catalonia can also be used.
Northern Catalonia forms a triangle between the Pyrenees to the south, the Corbières to the north-west and the Mediterranean Sea to the east. The Roussillon plain in the east, by far the most populated area, is formed by the flood plains of the Tech, Têt and Agly rivers (Catalan: Tec, Tet, Aglí). The districts of Vallespir and Conflent cover the upper valleys of the Tech and the Têt respectively. The massif of the Canigou (Catalan: Canigó), 2785 m, dominates much of the territory.