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A large blue hole is one of the geological wonders near the Yucatan Peninsula (the territory of the Belize state in Central America), which is a round funnel with a diameter of 305 m and 120 m in depth. The best types of this excavation are opened from a height. The images taken from the helicopter clearly show the border of dark and light water, the transparency of which allows one to see one of the longest coral reefs on the planet - the Lighthouse Reef atoll, part of the Belize Barrier Reef.
It is assumed that this geological formation was originally a system of limestone caves formed during the last glacial period. The sea level was then much lower, but when the ocean rose and the arch of the flooded cave collapsed, a karst crater formed - a fairly common form of relief along the coast of Belize.
There was also a version that the Blue Hole of Belize is a huge vessel in which the ancients kept something. In favor of this point of view said the fact that the walls of the hole are fairly even for accidental formation. In three-dimensional space, it can be represented as a large cylinder representing a reservoir.
A large blue hole is considered to be the largest among similar karst pits and therefore has been listed by UNESCO as a World Heritage Site.