The Complejo Náutico Ullúm is a recreational facility operated by the Universidad Nacional de San Juan, situated on the shores of the Embalse de Ullúm approximately 25 km west of the city of San Juan, accessible via Ruta Provincial N° 14.

The complex covers 26 hectares and includes direct water access for boats. Amenities include a confitería, extensive landscaped and forested grounds, and courts for soccer, volleyball, and beach handball.

The wooded areas support year-round outdoor recreation and create a pleasant microclimate for family outings beside the lake. A main hall accommodates up to 250 people and is available for events. Both members and non-members are welcome to use the facilities.