Ulldeter, Glacial cirque in Setcases, Spain.

Ulldeter is a glacial cirque in the Ripollès comarca, north of Setcases, where the Ter river rises. It is bounded by the Pic de la Dona (2,704 m) to the east, Bastiments (2,881 m) to the north and the Gra de Fajol to the southwest, and joins the circ de Morens to the north. Its northern part holds the Vallter 2000 ski area, with a run crossing the cirque to the Pla dels Hospitalets.

The cirque formed during the last ice age when massive ice sheets shaped the Pyrenees through continuous erosion and movement. The wide floor and steep walls are the result of this prolonged glacial activity.

Ulldeter takes its name from the source of the Ter, which rises in the cirque. From 1907 to 1909 the Centre Excursionista de Catalunya built the Ull de Ter chalet-refuge here at 2,391 m, designed by architect Jeroni Martorell, one of Catalonia's first mountain refuges. Franco's forces dynamited it in 1939 to keep the maquis from using it; remains stand near the Ter spring.

Access to the cirque comes through well-marked hiking trails from Setcases. Visitors should prepare for changeable mountain weather and bring proper footwear along with layered clothing.

The old Ull de Ter refuge, built between 1907 and 1909 at 2,391 m to a design by architect Jeroni Martorell, was blown up in 1939 by the Franco regime to stop the maquis from using it. Its remains still stand near the source of the Ter, about 500 m and 150 m of descent from the refuge opened in 1959.