In the American West,megafloods carved out a vast region called the Channelled Scablands,spanning hundreds of kilometres from Spokane,Washington,west to the volcanic Cascades Range.

• 在美洲西部，大洪水削斫出一个巨大的称为“河道疤地”的区域，从华盛顿斯波坎向西婉蜒几百公里到喀斯开火山山脉。