Flag for the Lowest Point in the United States - Badwater Basin Geographic Points: 116 Degrees West by 36 Degrees North

Everyone in the USA above 5th grade knows that that tallest place in the USA is Mt. Denali, Alaska.  But when you ask for the lowest point, you usually get a shrug.  Here the lowest point is Badwater Basin, and its geographic flag has the colours red, indigo, white, and yellow. 

The order of colours is based upon the rainbow. 

Image Credit - Wikipedia:
https://en.wikipedia.org/wiki/Badwater_Basin#/media/File:Badwater_Basin_from_Dante%27s_View_Overlook.JPG