The Port de Larrau (Puerto de Larrau) (elevation 1,578 m (5,177 ft)) is a mountain pass on the France – Spain border in the western Pyrenees between the department of Pyrénées-Atlantiques, France and Navarre, Spain.

Over this distance, the climb is 1,205 m (3,953 ft) (an average of 7.9%) with long sections at over 10% and the maximum gradient of 13% near the summit.

[2] Starting from Ochagavía (Navarre, Spain), the Puerto de Larrau is 19.3 km (12.0 mi) long with a 100 m. tunnel near the summit.

[citation needed] The climb from the south featured in the 2007 Tour de France on the 218.5 km (135.8 mi) stage 16 from Orthez to Gourette Col d'Aubisque.

This was probably the hardest climb in the 2007 Tour, sustaining almost the same gradient as the Col de Menté, but twice as long.