The Valdes Peninsula is a peninsula into the Atlantic Ocean in the Biedma Department of north-east Chubut Province, Argentina. Around 3,625 km2 (896,000 acres; 1,400 sq mi) in size, it is an important nature reserve which was listed as a World Heritage Site by UNESCO in 1999.
The nearest large town is Puerto Madryn. The only town on the peninsula is the small settlement of Puerto Pirámides. There are also a number of estancias, where sheep are raised.