This was at a ranger station/museum in the Waimea area. Looks like it was done by some sort of computer-generated cutting tool. It’s the entire 25 x 35 mile island of Kauai.
I shot this picture centered (at bottom) on Hanalei Bay—it’s that perfect 2/3-circle. Look at the way the mountains fan out in the same pattern. Na Pali coast on right. I believe the sand you see half-way up on the right is Polihale Beach, end of the road.