Iodine supplements usually aren't necessary if you live in the United States or in most developed countries. Some alternative medicine practitioners recommend iodine tablets or kelp supplements â which are high in iodine â for people with hypothyroidism.
The area within the entire watershed of the Rio Grande is some 336,000 square miles (870,000 square km). Because a large proportion of the riverâs basin is arid or semiarid, however, only about half of the total area, or about 176,000 square miles (456,000 square km), actually contributes to the riverâs flow.
In 1944, the US and Mexico signed a treaty regarding the river, and in 1997, the US designated the Rio Grande as one of the American Heritage Rivers. Two portions of the Rio Grande are designated National Wild and Scenic Rivers System, one in northern New Mexico and the other in Texas, at Big Bend National Park.