large, dark grey rock with a white and green, shell-like pattern on the upper portion of the rock, lying on a beach of small, white, pink and grey pebbles

large, dark grey rock with a white and green, shell-like pattern on the upper portion of the rock, lying on a beach of small, white, pink and grey pebbles. The rock is surrounded by the pebbles, with a single, darker grey pebble lying just to the right of the larger rock. The image was taken on a beach in Santa Teresa, Costa Rica, at the coordinates 9.632, -85.158.