Perhaps there was a time when that was true, but no longer.
Even the greatest of the world's rivers can no longer be assured
of reaching the sea unhindered. These days the Rio Grande/Rio
Bravo River, on the border of the U.S. and Mexico, often fails
to reach the Gulf of Mexico, its strength sapped by dams and
irrigation works diverting water to farmers' fi elds and city water
supplies. The Indus, the Nile, the Murray-Darling, the Colorado,
these are but a few of the once mighty rivers that now struggle
to touch the ocean.