The réseau Félix-Trombe or Coume Ouarnède is an underground karst network formed by a succession of wells and galleries dug into the limestone.

It takes its name from a famous French speleologist: Félix Trombe.

The réseau Félix-Trombe is located on the Arbas massif in the Pyrénées, south of the département in the région Occitanie.

It is a complex cavity due to its significant overall difference in altitude (1,001 metres) and its numerous entrances.

The main cavities that make up this network are:[1] : Also included are: :On 15 and 16 September 2001 in 22 hours, about twenty cavers travelled the entire network from the former highest point (the Gouffre de la Coquille) to the lowest point of the network (the Goueil di Her).