Panhe, was one of the largest Acjachemen villages, that is over 8,000 years old and a current sacred, ceremonial, cultural, and burial site for the Acjachemen people. The site of Panhe, is now within San Onofre State Beach, San Diego County, California, located at the confluence of San Mateo Creek and Cristianitos Canyon, approximately 3.7 miles (6.0 km) upstream from the Pacific Ocean.  The Acjachemen's fished in San Mateo Creek's extensive freshwater marshes, and practiced a hunter-gatherer lifestyle. The village of Panhe is estimated to have had a population of 300 or so before the first Spanish explorers came to the area, and is still a sacred site for the Native Americans.
Panhe is the site of the first baptism in California, and in 1769 saw the first close contact between Spanish explorers, Catholic missionaries, and the Acjachemen people.
The United Coalition to Protect Panhe and The City Project advocate for the preservation of the site.
- "San Mateo Creek Watershed Profile". Southern California Wetlands Recovery Project. wrpinfo.scc.ca.gov. Archived from the original on 2009-10-11. Retrieved 2009-09-19.
- "San Mateo Creek: An Overview" (PDF). San Mateo Creek Conservancy. trestleswetlands.org. Retrieved 2013-04-04.
- Donaldson, Milford Wayne (February 6, 2008). "Testimony regarding the Consistency Certification for the Foothill South Toll Road" (PDF). ohv.parks.ca.gov. Retrieved 2009-09-20.
- Save San Onofre and Native American Sacred Site Panhe