The unusual salt lake is one of the three of its kind in the area. The area with a salty crust around is protected by the government.
More information http://www.fws.gov/southwest/refuges/texas/STRC/lrgv/La%20Sal%20del%20Rey.html
Address 78563, United States
Coordinates 26°32'4.128" N -98°2'58.409" E