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 ...

such as the Blue Ridge escarpment in the southern Appalachian Mountains. The researchers also drew on real-world data from river networks in China, Taiwan and the United States. Drainage divides ...

One mountain ... dots across the United States represent some of the more than 600 place names that will soon change under new guidelines. Visitors can access this map and more information ...