Geography and Nature (Philippines)

River Basins, Lakes, Caves, and Hydrography

25 practice questions, each with the answer and an explanation.

Practise River Basins, Lakes, Caves, and Hydrography now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 25 questions

  1. What is the longest and largest river in the Philippines by discharge volume and drainage basin area, flowing 505 kilometers through northeastern Luzon?
  2. What is the second longest river system in the Philippines, draining a major basin across central Mindanao into the Moro Gulf?
  3. What is the largest lake in the Philippines and third largest freshwater lake in Southeast Asia, covering approximately 900 square kilometers?
  4. What is the second largest lake in the Philippines, located in Lanao del Sur and serving as the primary source of hydroelectric power for Mindanao via the Agus River?
  5. Which lake is shared between the provinces of Surigao del Norte and Agusan del Norte?
  6. Which lake in Camarines Sur is famous as the only natural habitat of the world's smallest commercial edible food fish, the sinarapan (Mistichthys luzonensis)?
  7. Which tidal estuary connects Laguna de Bay to Manila Bay, flowing 25 kilometers directly through the center of Metro Manila?
  8. Which dam and reservoir in Bulacan is a major source of hydroelectricity for Metro Manila?
  9. What subterranean geological wonder in Palawan features an 8.2-kilometer navigable underground river flowing directly into the West Philippine Sea?
  10. What is the largest cave system in the Philippines and third largest in Southeast Asia, located in Western Samar?
  11. Which cave complex on the southwest coast of Palawan is known as the 'Cradle of Philippine Civilization' where Tabon Man fossils were discovered?
  12. In which cave were Homo luzonensis fossils first discovered in 2007?
  13. Which waterfall of the Agus River lies in Northern Mindanao?
  14. What multi-tiered waterfall in Bislig, Surigao del Sur is celebrated as the 'Niagara Falls of the Philippines' due to its 95-meter-wide curtain of water?
  15. Which waterfall in Cateel, Davao Oriental is the country's highest waterfall?
  16. What deep spring river in Hinatuan, Surigao del Sur is renowned for its crystalline saltwater-blue hues and subterranean cavern system emptying into the Pacific Ocean?
  17. Which major river flowing through Central Luzon is the country's fourth largest basin, emptying into Manila Bay via an extensive delta in Bulacan and Pampanga?
  18. Which major river drains the Benguet highlands and the plains of Pangasinan, emptying into Lingayen Gulf?
  19. Which extensive protected wetland in Agusan del Sur acts as an enormous freshwater sponge absorbing monsoon floods and sheltering rare waterfowl?
  20. What massive swamp and marshland basin in Central Mindanao covers over 2,200 square kilometers across Maguindanao, Cotabato, and Sultan Kudarat?
  21. Which famous multi-tiered waterfall in Cavinti/Pagsanjan, Laguna is reached by 'shooting the rapids' in native wooden dugout canoes?
  22. Which earth-fill embankment dam on the Pampanga River lies in Nueva Ecija?
  23. Which major multipurpose dam on the border of Isabela and Ifugao is one of the largest dams in the Philippines, built along a major tributary of the Cagayan River?
  24. Which lake in Allah Valley near Surallah, South Cotabato, is the home of the T'boli people?
  25. What unique geological feature allows the Pasig River to experience reverse flow, moving water backward from Manila Bay into Laguna de Bay?

Keep practising

More general knowledge topics

All general knowledge →

Ready for more general knowledge?

Play the GK ChallengeGeneral knowledge hub