French naval doctor and explorer. Born at Lorquin, Moselle, Jules Crevaux undertook his first expedition to the interior of French Guiana in 1877, becoming the first European to explore the Tumuc Humac Mountains on the disputed border with Suriname. The following year, he explored the Oyapock basin and several tributaries of the Amazon.

His last, and longest, expedition began in 1880. Reaching the Guaviare River in Colombia on 20 October, he pursued a southward route and on 15 January 1882 discovered the remains of an Incan city near Salta in northwestern Argentina. It was during the course of this expedition that he and the entire party under his command were killed by the Toba people.

A peak in Suriname bears his name. His explorations are recounted in a number of his writings: Voyage en Guyane (1877), Voyage d'exploration dans l'intérieur des Guyanes (1876-1877), Voyage d'exploration du Guyane (1879), and Voyages dans l'Amérique du Sud (1878-1881). He also produced an atlas of maps of the rivers he travelled, which was published posthumously in 1883.