San Ildefonso Peninsula is a peninsula in

Central Luzon Central Luzon ( pam, (Reyun ning) Kalibudtarang Luzon, pag, (Rehiyon na) Pegley na Luzon, tgl, (Rehiyon ng) Gitnang Luzon, ilo, (Rehion/Deppaar ti) Tengnga ti Luzon), designated as Region III, is an administrative region in the Philippines, ...

, central part of

Luzon Luzon (; ) is the largest and most populous island in the Philippines. Located in the northern portion of the Philippines archipelago, it is the economic and political center of the nation, being home to the country's capital city, Manila, as ...

island,

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

, at . It is attached to the mainland through a 3.5 mile wide strip of land. Cape San Ildefonso can be found south of the peninsula. The peninsula is entirely under the jurisdiction of the municipality of

Casiguran, Aurora Casiguran, officially the Municipality of Casiguran (Tagalog/ Kasiguranin: ''Bayan ng Casiguran''; ilo, Ili ti Casiguran), is a 2nd class municipality in the province of Aurora, Philippines. According to the 2020 census, it has a population of ...

. The southern half of the peninsula is under Barangay San Ildefonso, the northern tip is under Barangay Culat, while the remainder belongs to Barangay Cozo.

References

Peninsulas of the Philippines Landforms of Aurora (province) {{CLuzon-geo-stub