The species is native to southwestern Madagascar.

The specific name, geayi, is in honor of French naturalist Martin François Geay (1859-1910) who collected the type specimen.

[3] The preferred natural habitats of L. geayi are forest, savanna, and sandy areas, but it has also been found in pastures and villages.

[1] L. geayi can grow to a total length (including tail) of 90–140 cm (35–55 in).

[citation needed] It is an opisthoglyphous ("rear-fanged") snake, having a pair of enlarged teeth at the rear of each maxilla (upper jaw).