Edited sentence: A  wide ledge that encircles the base of the formation on three sides (also called "Loop Road"; ).A low star-shaped platform (also called "Turtle Monument"; ).A passage  in width and  in height that looks like a tunnel (also called "Arch Gate", ).A straight row of huge stones along the south (outer) edge of the "Loop Road" (also called "Retaining Wall"; ).A triangular depression with three large holes at its north edge (also called "Triangle Pool"; ).Some of its details are:.The main feature is a rectangular formation measuring about  and about  tall; the upper terrace is about  below sea level, and a small part of it rises  above the water.Two huge stone slabs standing parallel to each other (also called "Twin megaliths"; )