The Alatna River

The Alatna River is a federally designated wild and scenic river partially contained within the boundaries of Gates of the Arctic National Park, Alaska. It is called one of the most beautiful rivers in the United States. The Alatna River stems from the central Brooks Range flowing through the Endicott Mountains, passing Circle Lake, the Arrigetch Peaks and Takahula Lake before entering the Helpmejack Hills.

The Alatna River

Puerto Princesa Underground River

The Puerto Princesa Subterranean River National Park is located about 50 km north of the city of Puerto Princesa, Palawan, Philippines. One of the 7 New Wonders Of Nature, it features a limestone karst mountain landscape with an 8.2 km. navigable underground river. A distinguishing feature of the river is that it winds through a cave before flowing directly into the South China Sea. It includes major formations of stalactites and stalagmites, and several large chambers. The lower portion of the river is subject to tidal influences. The underground river is reputed to be the world's longest. At the mouth of the cave, a clear lagoon is framed by ancient trees growing right to the water's edge. Monkeys, large monitor lizards, and squirrels find their niche on the beach near the cave.

Puerto Princesa Underground River