San Mateo, officially the Municipality of San Mateo, is a 1st class urban municipality in the province of Rizal, Philippines. According to the 2020 census, it has a population of 273,306.

Rizal, officially the Province of Rizal, is a province in the Philippines located in the Calabarzon region in Luzon. Its capital is the city of Antipolo. It is about 16 kilometers (9.9 mi) east of Manila. The province is named after José Rizal, one of the main national heroes of the Philippines. It is bordered by Metro Manila to the west, Bulacan to the north, Quezon to the east and Laguna to the southeast. The province also lies on the northern shores of Laguna de Bay, the largest lake in the country. Rizal is a mountainous province perched on the western slopes of the southern portion of the Sierra Madre mountain range.