An archipelago with irregular shape and about 7,641 islands and islets
Generally mountainous with mountains running north to south near the coastline
Extensive coastline of 34,600 km
Biggest water form is Sulu Sea
Few rivers and streams serving as transportation and irrigation
Lakes and waterfalls harnessed for industry
Many active, dormant and extinct volcanoes
Plains and valleys between mountains
Coral reefs skirting island edges
Wide expanse of territorial waters