Among the many works of Lislet-Geoffroy were a map of the Isles of France and Reunion published first in 1797 and second in a corrected version in 1802. He also published a chart of the Seychelles and a map of Madagascar. He made a voyage to Madagascar in 1787, and his account of the voyage was published in Malte-Bruns Annales de Voyages. Outside of geography, he worked in geology, showing that the shoal, Isle Plate around Mauritius was formed by the debris of the crater of a volcano. He also took detailed measurement of the climate of Mauritius for almost 50 years ending in 1834.
