There’s ~6 km of decent running along the Têt River in Perpignan. The Têt is the longest river in the Pyrénées-Orientales. The paths are a combination of pedestrian promenade above the river, and some sections at grade that are also cycle paths. There are nice views of the river, the historic sections of Perpignan, and the snowy Pyrénées in the distance. 

A good place to start is at the Archipel pedestrian/cycle bridge. Here, you can run east for 1.2 km to the Beltrame bridge on an elevated promenade, or use the stairs at Passeig Torcatis to run on the cycle path along the river. East of Pont Beltrame, the path is at grade. You run east for 4 km to Av de Lamans, or west for nearly 2 km to just past the railway bridge (where there’s a pedestrian path on the lower level).

Add-On Options; Use the Archipel or Joffre bridges to connect to paths along the Basse River (~700m).