San Luis Obispo County is the gateway to Paso Robles Wine Country, which numbers over 200 wineries, many of them small boutique vineyards. Zinfandel is the area's heritage grape varietal, although the Paso Robles AVA has earned acclaim for its Bordeaux varieties, particularly the Cabernet Sauvignon, as well as a number of innovative Paso Robles blends. Wine tourism is popular for California locals as well as visitors from further afield, who come to enjoy the vineyards along with other area attractions such as Morro Bay, Hearst Castle and the scenic drive up the Pacific Coast Highway. A combined around 100,000 acres were listed for sale in San Luis Obispo County, California, recently; the overall value of all San Luis Obispo County land and rural real estate for sale was almost $808 million. San Luis Obispo County ranks 11th in California for the total acreage of land currently advertised for sale. Paso Robles had the most land for sale. Based on its natural assets, tourism and recreation contribute significant revenue toward San Luis Obispo County's overall GDP. San Luis Obispo County is the 18th largest county (3,615 square miles) in California. It's located in the Central Coast California region of the state.