As the tide goes out it leaves ridges of sand where the water flows back to the shore, Puerto Peñasco, Gulf of California, Mexico

sand ridges sand flats intertidal beach sandy beach low tide cholla bay littoral zone mud flats gulf of california tide going out foreshore rock flats shoreline rocky point puerto penasco tide rocky shore waves bahia la choyas tidal pools ridges crevices pacific ocean marine biomes sea birds surf flowing desolate holes lonely laguna del mar seagulls ecology nature extreme ecosystem stream reflective sonora drastic change foreign mexico biodiversity cracks habitat