Scientists have been shocked to find sharks appearing in freshwater rivers—far from their usual ocean habitats! But how is this possible? Are sharks adapting, migrating, or is something else ...

Although freshwater environments, from creeks to rivers, brim with more than 10,000 species of fish, we may never get the chance to see many of these mysterious creatures as their populations decline.

Dive into California's freshwater fun beyond the ocean. Explore the Colorado River, Lake Tahoe, Lake Mead, and hidden Southland lakes.

The biggest source of salty freshwater in D.C. and other major northern inland cities is an overapplication of road salt to thaw winter ice, which runs off into rivers or the ground.

Few freshwater fish can match the size of the Mekong giant catfish, which can exceed 10 feet and weigh over 660 pounds. Native to the Mekong River, this gentle giant feeds on plankton rather than ...

Volcanic islands, such as the islands of Hawaii and the Caribbean, are surrounded by coral reefs that encircle an island in a ...

Many residents who live along the river in Croom have been trying to mitigate additional flooding as much as possible as well, but there is ongoing flooding in this area. The Withlacoochee River at ...

A group of environmental scientists serving the Delaware River near Pennypack Creek found about 120 freshwater mussels in the riverbed. The mollusks play important roles in improving water quality ...

Our most detailed look yet at the strange lakes of Saturn’s moon Titan has revealed a diverse seascape, similar to Earth’s combination of freshwater rivers and salty oceans. Radar measurements ...