Lea Monde is somewhere to the southeast of Rabanastre, in "Dalmasca Inferior," which is made up of Greylic's Bend and the Golmore Jungle regions. "Dalmasca Superior" is made up of the Dalmascan Desert (Westersands and Estersands).

Encyclopedia Eorzea II - From Nagxia to Yanxia: “Following their victory, the Empire divided the conquered Kingdom of Dalmasca into two regions. The desert south of the Skatay Range was dubbed Dalmasca Superior, with Rabanastre to serve as the seat of the provincial government, whereas the Golmore Jungle and Greylic’s Bend were named Dalmasca Inferior, with Lea Monde as its capital. Together, they would comprise the Diocese of Dalmasca, the Garlean Empire’s foothold in the Far East. Rabanastre became a key staging ground for imperial forces in the campaign, and from there the Empire advanced into Nagxia.”