North America - a continent of daring and drastic extremes, of conquerors and visionaries, of untamed wilderness and feats of human engineering - and its rivers are a fascinating example. The US has the largest dams, the deepest locks, the longest canals and aqueducts in the world. Rivers have been modified and manipulated, forced into man-made paths, controlled by computers, even their flow has b..

North America - a continent of daring and drastic extremes, of conquerors and visionaries, of untamed wilderness and feats of human engineering - and its rivers are a fascinating example. The US has the largest dams, the deepest locks, the longest canals and aqueducts in the world. Rivers have been modified and manipulated, forced into man-made paths, controlled by computers, even their flow has b..

North America - a continent of daring and drastic extremes, of conquerors and visionaries, of untamed wilderness and feats of human engineering - and its rivers are a fascinating example. The US has the largest dams, the deepest locks, the longest canals and aqueducts in the world. Rivers have been modified and manipulated, forced into man-made paths, controlled by computers, even their flow has b..

North America - a continent of daring and drastic extremes, of conquerors and visionaries, of untamed wilderness and feats of human engineering - and its rivers are a fascinating example. The US has the largest dams, the deepest locks, the longest canals and aqueducts in the world. Rivers have been modified and manipulated, forced into man-made paths, controlled by computers, even their flow has b..

North America - a continent of daring and drastic extremes, of conquerors and visionaries, of untamed wilderness and feats of human engineering - and its rivers are a fascinating example. The US has the largest dams, the deepest locks, the longest canals and aqueducts in the world. Rivers have been modified and manipulated, forced into man-made paths, controlled by computers, even their flow has b..