AUSTIN, Texas — The Texas Hill Country is famed for its breathtaking scenery, with rivers like the Guadalupe winding through steep hills and rugged valleys. But beneath that beauty lies danger — this region is among the most flash flood-prone areas in the United States.

Families sifted through waterlogged debris Sunday and stepped inside empty cabins at Camp Mystic, an all-girls summer camp ripped apart by flash floods that washed homes off their foundations and killed at least 70 people in central Texas.