The United States is packed with iconic walks and famous trails, but few adventures are as challenging as this incredible ...

The Mississippi River is second from the left. Photograph from David Rumsey Map Collection ... of rivers and mountains of the world is from an 1864 Atlas published in the United States.

so when we see a percentage like that we might not realize how many waterways there are in the United States and how many are threatened. The map above gives you an idea of the number of rivers ...

The United States has 3.5 million miles ... Ohio is one of the largest cities on the Ohio River. The Ohio River runs from the Appalachian Mountains and foothills across the Midwest to empty ...

In recent decades that has amounted to far more than half of the river’s flow, and it forces farmers and others in the Rocky Mountains ... farmland in the United States. It will do its part ...

Myriad weather alerts and warnings remain in place across the United States from eastern ... a powerful atmospheric river storm breaks on February 14 in the San Gabriel Mountains above Altadena ...

yooperann via Flickr under CC BY-NC-ND 2.0 Over the last 36 years, a third of the United States' rivers have changed color ... findings in an interactive map. Changes in color can clue scientists ...

The U.S. Department of the Interior has recently announced that it will be replacing the names of more than 660 geographic features in the the United States ... 660-plus rivers, mountains, and ...

The 7 tallest mountains in the United States might surprise you. When most people think of a mountain they picture a snow-capped peak reaching high into the clouds.