The Ecological Culture Exploration Site on Oido Island in Siheung is abundant in natural resources and historic relics dating back to the prehistoric era. The name of Oido refers to its shape resembling the ears of a crow. Shell mounds are scatted across the island, with the scale of the shell mounds being the largest along the west coast, making this island loved by many tourists. In addition, these shell mounds are the only relics that give any information about exchanges between Korea’s Neolithic populations. They show evidence of exchanges between the northern and southern populations that inhabited the peninsula and larger continent, and how the coastal environment along the west coast changed during the Neolithic Age.
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