A geographic flag for the lowest point

A flag for the lowest point of particular area.  In this case it can be flown at Death Valley, which is 86 meters below sea level, that like 9 telephone poles deep.  The flag has blue field and white rectangular canton.   This flag can also be flown at lowest point of particular nation, state, sub federal district, or continent. 

Thus for each continent, it can be flown at:
- Lake Assal in Africa, 153 meters below sea level
- The Dead Sea in Asia, 423 meters below sea level
- Lake Eyre in Australia, 16 meters below sea level
- The Caspian Sea in Europe, 28 meters below sea level
- Bad Water, Death Valley, 86 meters below sea level
- Laguana del Carbon of Argentina in South America, 105 meters below sea level