Cirque de Cagateille, Glacial cirque in Ustou, France.

Cirque de Cagateille is a glacial cirque in the Pyrenees shaped by ancient ice movement. The landscape features steep rock walls surrounding a valley floor with streams that flow through the terrain.

The cirque formed during glacial periods when ice masses carved deep into the mountain landscape. This geological feature ranks among the characteristic structures shaped by ancient climate patterns in the Pyrenees.

The name Cagateille comes from the local Occitan toponymy of the Haut-Salat valley in Couserans. Iberian ibex were reintroduced here in 2014, and the animals now live on the cirque's slopes. The cirque and its hanging valleys were classified as a natural site by decree on 15 September 1993.

Access is on foot via marked trails with varying difficulty levels. Weather conditions vary by season, with some sections becoming wet and muddy during rainy periods or snowmelt.

The cirque lies within the perimeter of the Pyrenees Ariégeoises Regional Natural Park and was classified as a natural site by decree on 15 September 1993, together with its hanging valleys. The Iberian ibex was reintroduced here in 2014, so hikers on the GRT 59 may spot it on the slopes.