Masella occupies the northern slopes of Tosa d'Alp mountain in La Cerdanya, delivering 74km of marked terrain across 35 runs that rise from the Pla de Masella base at 1,600m to the summit at 2,535m — a vertical drop of 935m that ranks as the largest skiable descent in the Eastern Pyrenees. What makes Masella's terrain layout genuinely distinctive is its forest cover: approximately 80–90% of the resort's runs thread through dense black pine forest, with only the upper mountain breaking into open alpine ground above the treeline.

This configuration provides natural wind protection and preserves snow quality across the majority of the ski area, while giving the mountain a character quite different from the open-bowl resorts more common in the Aragonese Pyrenees. Terrain is spread across 14% beginner, 37% intermediate, 34% advanced and 15% expert runs.

Masella's headline feature beyond the skiing itself is its night operation — the resort holds the title of the largest floodlit ski area in the Pyrenees, with 13 illuminated runs covering around 10km of lit terrain served by seven lifts and operating until 9:00pm. This makes Masella a viable evening destination for Barcelona-based visitors and one of the very few places in the Spanish Pyrenees where a full après-dark ski session is genuinely on the table.

The resort also carries one of the most extensive snowmaking networks in Spain, with 380 snow cannons covering approximately 30km of piste — infrastructure that supports consistent conditions from the December open through to the late April close.