A horrifying truth dawns: this boundless night isn't a sky, but a colossal cave. This is the lot of the Underdark, and you, ...

Drop to the right of the bridge, and you'll be on the magma river. Keep walking straight, and you'll eventually find the first Fire Date tree. From here, you can turn to the left and start ...

The playful North American river otter is equally at home in the water and on land. It makes its home in a burrow near the water's edge, and can thrive in river, lake, swamp, or estuary ecosystems.

Before Earth became the blue planet, it was engulfed by a very different kind of ocean: a vast, deep magma ocean reaching down hundreds or perhaps even thousands of kilometers. As early Earth's ...

Since then, multiple eruptions have tapped a source of magma at the base of the crust under the island nation. That magma ...

On a National Geographic River Cruise operated by Ama Waterways, a leader in luxury river cruising, a world-class ship is your base to explore historic waterways. Step aboard and unpack just once ...

The Ganges river in India is more than 2,500km long and has the most populated river basin in the world. Hundreds of millions of people and a huge range of wildlife rely on the river Ganges. But ...

A river is divided up into three sections called courses. There is the upper, middle and a lower course. A river starts in the upper course, usually an elevated section of land such as a mountain ...

If you'd like to take a cruise but aren't interested in the hustle and bustle of a massive ocean liner, consider a river cruise. River cruises offer the chance to visit lesser-known ports around ...

Find below the best European river cruises in 2024, including Scandinavian-chic Viking River Cruises, family-friendly A-Rosa River Cruises and fine dining–focused Riverside Luxury Cruises.