Riwon pebbles are distributed on the shore of the East Sea of Korea in the Rahung Workers’ District, Riwon County, South Hamgyong Province.
Cliffs consisting of hard quartzite sprawl along the coast on both sides of the mouth of the Phohang Stream. Exposed to waves, the bottoms of the cliffs have been abrased into platforms scores of metres wide.
At first lumps of weathered quartzite fell apart and they were eroded by waves into big and small pebbles round and smooth.
Pebbles are scattered along the arch-shaped beach 800 metres in length and 30 metres in width.
The stones are 2 to 30cm in diameter, mostly around 15cm and the biggest up to 33cm.
In general, the stones get smaller towards the sea, and those in the part adjoining sea water are as small as gravels or coarse sand grains.
As rare natural pebbles at home and abroad, they are on the list of natural monuments for their scenic and academic significance.
Kim Pong Ju
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