Here's another location of a crater in Mexico: do a search for "ciudad de carmen." The caves that exist in this area were formed from a meteor impact, and the caves exist along the edge of the impact. It creates a ring formation in the area, and it was also only recently discovered. Half of the crater is in the water, the other half of the crater is on land. Also, very close to this area, people theorize that the "gulf of mexico" was an impact crater that might've caused the dinosaurs to die. The yucatan peninsula sure has an odd shape, and in the water, it almost forms a circle around the gulf of mexico. The BBC series "earth: the biography" examines meteor impacts and craters that exist on the planet. It was a great natural science series, and it was very fun to watch.