Lake Superior

Superior is the largest of the Great Lakes, and ranks as the second largest in the world by surface area. It is 350 miles long and 160 miles wide, with an average depth of 489 feet. 

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Rolf Peterson

The National Park Service has announced a plan to import wolves to Isle Royale National Park, a move designed to restore the natural balance between predator and prey. And that means the island's moose had better watch out.

USGS

A new study explains how the bloody red shrimp -- and other non-native species -- can travel across the Great Lakes. It's pretty simple: They hitch a ride in the ballast tanks of "lakers," the ships that travel around the lakes, but never make it out to the ocean.

NASA

The nation's rush to increase oil production is having a long-distance impact on the Great Lakes region.

Geologic formations have given parts of the region ample deposits of sand, including the hard, round version that is used in fracking. Seen from space a few months ago by the Landsat 8 satellite, the light brown mines dot a landscape of green fields and forests. 

Ontario Ministry of Natural Resources and Forestry

On Lake Superior, wolves and their prey are starring in a pair of life-or-death dramas. 

On a Canadian island, wolves threaten to wipe out a once-strong herd of caribou -- triggering rescue efforts. Across the lake, on the U.S. side, the decline of a wolf pack has led to a skyrocketing moose population -- and pleas to import more wolves.  

Dave Rosenthal

If you like ice, you have to love the Great Lakes, where it comes in all shapes and sizes. With the recent deep freeze, we're seeing a lot more ice than in the past few winters -- including a frosty Niagara Falls. ​Here's a look at some unusual shapes and sizes:

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