The Otay Subregional Plan area is approximately 28,380 acres in size. The plan area is located in the most southwesterly corner of the unincorporated county, bordered by the Jamul/Dulzura subregion to the north and east, the City of Chula Vista to the west, and the international border with Mexico to the south. The subregion is characterized by the Otay reservoir, two detention facilities, a landfill, proximity to the Mexican border, and the San Ysidro Mountains. There are two active specific plan areas within the subregion. East Otay Mesa is proposed as a commercial and industrial site that is to serve as a major employment area for southern San Diego County. Otay Ranch consists of a resort and a variety of residential designations, ranging from 0.7 to 15 dwelling units per acre. The subregion is largely undeveloped and in public ownership.