is about 6,200 km from mainland France, about 2,200 km southeast of Florida, about 580 km from the coast of South America (Venezuela) and, more specifically, with Guadeloupe, in the heart of the Lesser Antilles. Topography, geology and hydrography The island of Marie-Galante is an elevated atoll resting on a rugged limestone substrate, located on the outer arc of the Caribbean plate. A fault called "la Barre" separates the northern quarter from the rest of the island. The north coast, facing Grande-Terre, is characterized by a high cliff, while the highest point, the Morne Constant (204 m altitude), is located to the east, in the territory of the municipality of Capesterre-de-Marie-Galante. The island has one main islet: l'îlet du Vieux-Fort or Vieux-Fort Islet. Two rivers flow there after crossing the island's plateau from the heart of the island: The Vieux-Fort River (the second most important river on the island) - located in the north in the territory of the commune of Saint-Louis, it flows from east to west of the island of Marie-Galante, flows into the Atlantic Ocean south of the place called Vieux-Fort, which was the first European settlement on the island,6 at the height of the Anse du Vieux-Fort. The Saint-Louis River (formerly the Saint-François River), 17.3 km long, is the main river on the island. It rises to about 160 meters above sea level, at a place called Nesmond, in Capesterre-de-Marie-Galante, and then crosses the island from east to west through its middle and separates the municipality of Saint-Louis to the north from that of Grand-Bourg to the south. This watercourse, fed by the waters of many small ravines and streams, flows into the Atlantic Ocean south of the town of Saint-Louis, at the northern boundary of the Folle-Anse marsh. Climate Marie-Galante, like the rest of the Guadeloupe archipelago, enjoys a tropical climate tempered by the maritime influences and the trade winds to which it is subjected. There are two seasons on Marie-Galante and the neighboring islands: a dry season locally called carême which runs from January to June ; a wet season locally called hivernage from July to December. As for the temperature, with an average of 27 °C, there is little difference between the hottest months (from 25 °C to 32 °C) and the coldest (from 23 °C to 29 °C). Marie-Galante and its limestone plateaus can regularly suffer from severe droughts. The average seawater