Grande-Terre Island is the name of the eastern-half of Guadeloupe proper, in the Lesser Antilles. It is separated from the other half of Guadeloupe island, Basse-Terre, by a narrow sea channel called Rivière Salée. Pointe de la Grande Vigie, in Grande-Terre, is the northernmost point of Guadeloupe island. To the east lies La Désirade, to the south lies Marie Galante
Despite its name, Grande-Terre is smaller than Basse-Terre Island. It was called like that, in contrast with the much smaller Petite Terre Islands, two very small islands located about 10 km south-east of the Grande-Terre.
Wikipedia https://en.wikipedia.org/wiki/Grande-Terre
Coordinates 16°19'34.262" N -61°25'40.432" E