Port Ainé is a ski resort located in Rialp, in the Catalan Pyrenees, inaugurated in 1986.

In March 2013, Port Aîné hosted the fourth stage of the Volta a Catalunya .

Daniel Martin won at the top ahead of Joaquim Rodríguez and at the same time became the leader of the race.

Thomas De Gendt won after a breakaway while Nairo Quintana managed to grab the leader's jersey he took from Dan Martin by releasing the other favorites Richie Porte and Alberto Contador in the last kilometer.

Esteban Chaves won the stage finishing at Port Ainé in the 2021 edition and Tadej Pogačar in 2024.