The world’s biggest sinkhole is believed to be the Great Blue Hole off the coast of Belize. In this instance, a limsetone cave system collapsed as the oceans rose, leaving a 300-meter wide, 125-meter deep feature some 60 miles from the coast of Belize.
Check out this super easy Raised bed garden design! And you can put little flowers in the cinder block holes as a cute, colorful border too! I'm definitely going to be doing this for my vegetable garden this spring! LOVE