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 Plain of Roussillon in the east , by far the area where more people live , is formed by the floodplains of the Tech , Têt and Agly rivers ( Catalan : Tec , Tet , Aglí ) .