Valle Viejo is a central department of Catamarca Province in Argentina.

The provincial subdivision has a population of about 24,000 inhabitants in an area of 540 km2 (210 sq mi), and its capital city is San Isidro.

Around 1,000 years ago the area was settled by a population of farmers and hunters.

The population created buildings, irrigation systems, and various fortifications.

This article about a place in Catamarca Province, Argentina is a stub.