ALG-376, Monolith Arch, North Idou Maze Area. 11.4 meter span (measured). GPS 32R 550695 2751548. In the chamber containing ALG-375 (Porthole Arch), look on the right (north) for a side crack. Climb inside the short crack to access an upper flat terrace. The arch is located on the right on the side of the terrace. Due to the closeness (some centimeters) of a monolith behind the span and a precipitous cliff beside, photographing the arch is a great challenge. This is probably the best picture possible.