"Today, the Arkong Bato marks the boundary between Barangay Santulan in Malabon and the arch’s namesake, Barangay Arkong Bato in Valenzuela. http://www.valenzuela.gov.ph/index.php/the_city/people"
"This stone arc was built by the Americans in 1910 and served as the boundary between the provinces of Rizal and Bulacan. http://www.valenzuela.gov.ph/index.php/the_city/people"