Vallée de Mai Nature Reserve is a nature park and UNESCO World Heritage Site (inscribed in 1983) located on the island of Praslin, Seychelles. It was officially declared a nature reserve on 18 April 1966. It consists of a well-preserved palm forest made up of the endemic Coco de Mer, as well as five other endemic palms. The Coco de Mer has the largest seeds of any plant in the world; the leaves growing up to 6 m wide and 14 m long. Also unique to the park is its wildlife, including birds such as the rare Seychelles Black Parrot, mammals, crustaceans, snails, and reptiles.
The Coco de Mer (Lodoicea maldivica), the sole member of the genus Lodoicea, is a palm endemic to the islands of Praslin and Curieuse in the Seychelles. It formerly also was found on the small islets of St Pierre, Chauve-Souris and Ile Ronde (Round Island), all located near Praslin, but has become extinct there. The name of the genus, Lodoicea, is derived from Lodoicus, the Latinised form of Louis, in honour of King Louis XV of France.