First area is in Bahrain- Saudi Arabia, off the coast. A series of underwater 'arrows' that seem to be aligned to true North. All are pointing in the same direction and many are located a good distance from the shoreline on the adjacent sand bars. Some of the 'arrow' features seem to be buried by sand.

This first download includes 24 placemarks of the 'arrows' and a few linear features.

Does anyone know what these underwater features could be?