The longest underground river: Puerto Princesa Underground River, Palawan, 24-kilometer (15 mi) cave containing an 8.2-kilometer (5.1 mi) underground section of the Cabayugan River[6]
The highest temperature (as officially recorded by the PAGASA): Tuguegarao, Cagayan, 42.2 °C (108.0 °F), April 29, 1912 and May 11, 1969[7]
The lowest temperature (as officially recorded by the PAGASA): Baguio, 6.3 °C (43.3 °F), January 18, 1961[8][9][a]
Largest serving of balut: Pateros, 117.5 kilograms (259 lb).[32]
Largest attended papal gathering: Mass by Pope Francis in Rizal Park, Manila on January 18, 2015, attended by 6–7 million people (also largest in the world)[33]
Largest banknote: ₱100,000 bill, launched in 1998, dimensions of 356mm width and 216mm height[34]
Largest gong ensemble in the world, which was participated by 3,440 people in Tabuk, Kalinga in February 2023[35]
Largest banga dance in the world, which was participated by 4,681 people in Tabuk, Kalinga in February 2023. The dance uses ‘bangas’ or clay pots, which is used to carry water and balanced in the head[36]
^Reports by local news outlets regarding temperature in Mount Pulag, which is usually claimed to drop below zero during the cold months of December to February, cannot be verified by the PAGASA.[10]
^"Laguna de Bay; Origin". Laguna Lake Development Authority. Retrieved March 5, 2020. The studies conducted by LLDA-NIGS in 1999 on the bathymetry and sediment quality of the Laguna de Bay showed that the surface area was 949 km2 or 949,000 hectares.
^"Islands of Philippines". Island Directory Tables. United Nations Environment Programme. Retrieved April 18, 2016.
^Philippine Yearbook. Republic of the Philippines, National Economic and Development Authority, National Census and Statistics Office. 2010. p. 25. Retrieved March 5, 2020.
^"Baguio records 4th coldest temperature in history". National Nutrition Council. February 16, 2017. Archived from the original on May 15, 2019. Retrieved May 15, 2019. The lowest temperature in the city was officially recorded by PAGASA on January 18, 1961 at 6.3 degrees Celsius...
^Moulic, Gobleth (February 16, 2017). "Baguio coldest in 46 years". Philippine Daily Inquirer. Archived from the original on June 22, 2018. Retrieved May 15, 2019. The coldest morning [in Baguio] was 6.3 degrees on Jan. 18, 1961.
^Yap, D. J. (January 24, 2013). "Pagasa unable to confirm temperature drops to zero on Mt. Pulag". Philippine Daily Inquirer. Archived from the original on January 27, 2013. Retrieved May 15, 2019. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (Pagasa) does not have a monitoring station on Pulag, the country's second highest peak, where the cold is reputed to reach 2 degrees Celsius during this time of the year. Pagasa administrator Nathaniel Servando said he heard the reports about the zero degree temperature but he could not confirm it himself.
^ ab"List of Provinces". PSGC Interactive. Makati City, Philippines: National Statistical Coordination Board. Archived from the original on April 19, 2016. Retrieved March 5, 2020.
^ ab"List of Cities". Philippine Statistics Authority. September 30, 2015. Archived from the original on November 13, 2015. Retrieved March 5, 2020.