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The country's largest province is also its last frontier: a protected archipelago of 1,768 islands, located between the South China Sea and the Sulu Sea. Intrepid travelers can discover its unique wilderness by swimming across the Danao, a volcanic lake, and boating along Puerto-Princesa, the longest underground tributary in the world and one of two UNESCO World Heritage sites in the region. The 18-day journey costs $4,600, airfare not included. Future adventures include Mozambique and Mongolia. www.pioneerexpeditions.com


