The rift valley contains the Jordan River and the Dead Sea, which separates Jordan from Israel and the Palestinian Territories. Jordan has a 26 kilometres (16 mi) shoreline on the Gulf of Aqaba in the Red Sea, but is otherwise landlocked.
Antidiuretic hormone binds to receptors on cells in the collecting ducts of the kidney and promotes reabsorption of water back into the circulation. In the absense of antidiuretic hormone, the collecting ducts are virtually impermiable to water, and it flows out as urine.
ADH is not the only hormone that helps with the regulation of kidney function - aldosterone (from the adrenal cortex) as well as parathyroid hormone (from the parathyroid glands) affects the balance and regulation of electrolyte content of the blood and body fluids.