Port de Rat is a high mountain pass at an elevation of 2.391m (7,844ft) above the sea level, located in the Pyrenees, on the border between France and Andorra. It's one of the highest mountain roads of the country.
The road to the summit is called CS-380 road. It’s gravel, pretty steep, but in pretty good conditions. It’s totally impassable from October to June (weather permitting). It starts at the Arcalis parking lot. It’s 2.4km long. At the summit there’s an unfinished tunnel, which had to connect Andorra and France.
Avoid driving in this area if unpaved mountain roads aren't your strong point. Starting from Andorra, the ascent is 27.6 km long. Over this distance, the elevation gain is 1.333 meters. The average percentage is 4.8 %. Do not travel this road in severe weather conditions. Avalanches, heavy snowfalls and landslides can occur anytime, being extremely dangerous due to frequent patches of ice. It is recommended that beginner riders avoid this road.
At the summit there’s a gravel 4x4 rough road climbing up to Refugi Les Portelles, a high mountain refuge-restaurant at an elevation of 2.568m (8,425ft) above the sea level.