Lac de l'Ospedale, Reservoir in Corse-du-Sud, Corsica, France

Lac de l'Ospedale is an artificial reservoir in southern Corsica surrounded by pine forests and rocky slopes rising from the water. The dam supplies drinking water to villages below and stores water during dry periods for local use.

The dam was built in the late 1970s using levée techniques and came into service in 1979, operated by the Office d'Equipement Hydraulique de Corse. It is a riprap structure 26 m high and 135 m long, impounding 2,860,000 m³, with an upstream wall made impermeable by a bituminous geomembrane under precast concrete blocks. Its crest sits at 951 m and it is inspected completely every ten years.

The village of L'Ospedale, Corsican U Spidali, takes its name from a regional hospital once sited here. The D368 along the southeast shore is regularly used by the Critérium international cycling race. The reservoir lies within the 733-hectare Forêt de l'Ospedale.

A winding mountain road with scenic views leads up to a parking area near the dam where visitors can easily start their visit. The site offers good access for walking along the shore and starting hikes into the surrounding forest trails.

The lake has two outlets: the Ruisseau de Palavesani, which joins the Petra Piana to form the Piscia di Gallo stream, the main branch of the Oso, and a second overflow outlet at the southwest end that drains toward the Artoli and the Stabiacciu basin. Water is diverted from the Asinao, on the Incudine slopes of the Rizzanese basin, into the Oso basin.