Ocha Rock is on the south-west shore of Lagoon Monggum tens of kilometers away from the town of Ryongyon County, South Hwanghae Province, DPRK.
Jangsan Point is the extension of the Pultha mountain range, forming a peninsula. Jangsan Point was formed by the abrasion of quartzite.
The singular Ocha Rock was also formed by such phenomenon. On the shore are standing some cliffs as high as ten to thirty meters. Ocha Rock is twelve to fifteen meters tall and about ten meters round in its bottom.
Ocha Rock is made up of regular layers.
This rare rock formed by abrasion and weathering is of great academic significance and also of great rarity on the coast of the Korean West Sea.
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