Dune Allen and Blue Mountain Beach – Heading a few miles east you’ll begin to enjoy all that is 30A in Dune Allen and Blue Mountain Beach on the “quiet side” of 30A. Here you’ll find a great mix of permanent residences as well as vacation properties mostly all located near the beach or around either of the area’s 2 coastal dune lakes. Blue Mountain Beach gets its name from the magnificent Blue Lupine plant that grows wild all around the area.