San Antonio Oeste is the most important port city in Rio Negro Province of Argentina, with 20.000 inhabitants. It is well known because of its beach in the suburb of Las Grutas, a nice seaside resort. The town is located near the Bay of San Antonio in the Gulf of San Matías.
Whether the proper San Antonio Oeste is a quiet and lovely town, the Las Grutas beach becomes very crowded in January and February, as it has converted into a "in" place since the 1990s. It is mostly visited by families and young people. Best time to visit is late summer and early autumn, when the water is very warm - it's the warmest of Argentina because of the good climate of the area - and there are less tourists.
