Libertador San Martín is a municipality in Entre Ríos Province, central Argentina. It is located alongside National Route 131, near the city of …Libertador San Martín is a municipality in Entre Ríos Province, central Argentina. It is located alongside National Route 131, near the city of Crespo, and about 60 km from provincial capital Paraná. The town is home to the Universidad Adventista del Plata and the Sanatorio Adventista del Plata. The majority of its residents are Seventh-day Adventists.