San Pasqual Valley, historically spelled as San Pascual, is the northernmost community of San Diego, California. It is named for the Kumeyaay village of San Pasqual that was once located there. It is bordered on the north by the city of Escondido, on the east and west by unincorporated land within San Diego County, and on the south by th…San Pasqual Valley, historically spelled as San Pascual, is the northernmost community of San Diego, California. It is named for the Kumeyaay village of San Pasqual that was once located there. It is bordered on the north by the city of Escondido, on the east and west by unincorporated land within San Diego County, and on the south by the city of Poway and the community of Rancho Bernardo. San Pasqual Valley is home to the San Diego Zoo Safari Park.