During hot weather, many people like to visit the beach to enjoy the waves, sand, and reefs. While these are common sights at the sea, have you ever seen a coast covered in rounded boulders, with more than one present?

Located near the small fishing village of Moraki on the east coast of New Zealand's South Island, there are more than fifty rocks of different sizes and round shapes scattered about.

They are called Moraki boulders and weigh several tons, with large and small round rocks clinging to this quiet beach, silently guarding this side of the pure land. However, the most fascinating thing about these large round stones is that they are not all solid, and some are even hollow.

Geologists believe that these large round boulders were formed between the Eocene-Paleocene, about 65-33 million years ago. Statistics show that of the more than fifty boulders standing on the coastline, one-third are 0.5-1 meters in diameter, and the other two-thirds are 1.5-2.2 meters in diameter.

They are almost all-around or nearly round in shape, and in those boulders containing fissures or hollows, many shells, fish teeth, coral fragments, and other remains of marine life can be found.

However, intact spherical boulders have good resistance to weathering, and such boulders can be preserved for a considerable period of time. Additionally, a significant number of boulders remain buried beneath the silt of the beach, and tidal erosion continues to reveal new boulders. This wonder of the world has been preserved for a long time.

The Moraki boulders were originally laminated sediment of mud, clay, sand, and other debris from the land in seawater, as well as tiny biological shells in seawater that were precipitated to the sea floor. The "growth" process of the Moraki boulders was a long one, lasting about 4 million years.

These rounded nodules were usually formed in shallow waters, and later plate tectonic movements "pushed" these boulders and their surrounding sediments together, exposing them to the shore, where tides and waves washed away the fine-grained, unconsolidated sediments, leaving these boulders.

In fact, geologists have found similar phenomena in other places. For example, they are found on the beaches of Port Hecienga on the North Island of New Zealand, with the largest being 3 meters in diameter; along the Cannonball River in North Dakota, USA, such large spherical nodules, the largest being 3 meters in diameter, and those found in northeastern Utah and central Wyoming are astonishingly 4 to 6 meters in diameter.

Additionally, local archaeological institutions in New Zealand believe that the round rocks were created by a combination of seafloor organisms and unique geological structures that grew through chemical reactions.

However, no solid evidence has been found to support these claims, and the reason for the formation of these rocks remains a mystery. These mysterious round rocks are magnificent, bringing people great shock, and letting them deeply feel the magic of nature.