San Ildefonso Peninsula

{{Short description|Peninsula located in Aurora}}

{{More citations needed|date=February 2022}}

Image:San Ildefonso Peninsula NASA.jpg

San Ildefonso Peninsula is a peninsula in Central Luzon, central part of Luzon island, Philippines, at {{Coord|16.1583333|N|122.0969444|E|}}. It is attached to the mainland through a 3.5 mile wide strip of land.{{cite book |title=Sailing Directions (enroute): Philippine Islands |date=1993 |publisher=The Center |page=156 |url=https://books.google.com/books?id=W1RhmERv_I0C&pg=PA156 |access-date=9 February 2022 |language=en}} Cape San Ildefonso can be found south of the peninsula.{{cite book |last1=Survey |first1=U. S. Coast and Geodetic |title=United States Coast Pilot: Philippine Islands: Luzon, Mindoro, and Visayas |date=1927 |publisher=U.S. Government Printing Office |page=91 |url=https://books.google.com/books?id=aZ4FAAAAMAAJ&pg=PA91 |access-date=9 February 2022 |language=en}}

The peninsula is entirely under the jurisdiction of the municipality of Casiguran, Aurora. 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. The peninsula is border by water on 2 sides, to the west is the Casiguran Sound, and to the east is the Philippine Sea.