Last month's discovery occurred along the Columbia River corridor, Hanford's most sensitive area.

WSJ: Toxic Radioactive Find Adds to Hanford Cleanup Woes

U.S. and Iraqi forces have been launching a series of operations against insurgents in western Anbar towns near the Syrian border and the Euphrates River corridor since earlier this year.

CNN: U.S. military targets Ramadi area before election

The Hudson River flight corridor must not continue to be the Wild West.

ECONOMIST: Business travel

For two decades, beginning in 1985, the city worked to clean up a blighted 13-mile industrial corridor along the Tennessee River, a stretch so filthy that motorists used to have to use their headlights during the day.

FORBES: Back on Track

There is no sign that the Yangtze or Pearl River deltas, or the Beijing-Tianjin corridor further north, are running out of steam.

ECONOMIST: The other China

But the Bosnian government also needs the Posavina corridor for vital access to the Sava River.

CNN: Bosnia divided before and after the war

Since there is little scientific data on the survival within estuary and ocean habitat, conservationists say recovery efforts should target the migration corridor, which has been greatly impacted by the four lower Snake River dams.

CNN: Dam removal: Too little, too late for salmon?

Amtrak also said it is essential to the entire Northeast Corridor to build new tunnels connecting New York to New Jersey under the Hudson River.

MSN: Amtrak plans 37-minute train from NY to Philly