Possible Clues:

• Hypersaline spot
• World's lowest-lying body of water
• Jordan River's terminus
• Terminus of the Jordan River
• The main container for lots of salt
• With ease one might add salt to that water
• There's no quick water there and no way to the ocean
• River Jordan flows into this
• Notices posted in a river and a large salt lake
• Very inconclusive sighting of aquatic creature in lake