At the center of the park are two deep canyons carved by the Green and Colorado Rivers.

VOA: special.2009.04.15

In eighteen eighty-two, Congress passed the "Rivers and Harbors Bill."

VOA: special.2010.04.29

But the head of the rescue services blamed shoddy building for the disaster, saying too many houses had been built too close to rivers and the seafront in an area hit by landslides two years ago.

VOA: standard.2009.10.10