This photo comes from the St. Martin's Caves in New Brunswick, Canada. The tides here, along the Bay of Fundy, are of a great magnitude, so during high tide the water rises up so high that the caves are no longer visible! During low tide though, visitors are free to explore the two large caves at their leisure!
Thank you for your participation and submission. Due to a large amount of entries I will be picking other images to go further. Tomas