hydrology

Satellite image showing the changing river patterns of the Amazon River. Image: NASA, public domain.

Geography Facts About the Amazon River

Caitlin Dempsey

The Amazon River is one of the world's longest and largest rivers.  Here are some interesting geographical facts about the Amazon River.

Geography Facts About the Mississippi Watershed

Caitlin Dempsey

The Mississippi watershed is the largest drainage basin in North America.

Learn to Use GIS to Map and Analyze Surface Water Data

Caitlin Dempsey

Esri Press recently published a book to teach users how to use GIS to analyze surface water using the National Hydrography Dataset produced by the USGS.  

The Caño Cristales up close. Photo: Mario Carvajal, Caño Crystals Project.

Caño Cristales, the Rainbow River

Elizabeth Borneman

The river Caño Cristales, is also known as the river of five colors for the vibrant path it winds through the Colombian landscape.