Oido Island 오이도

The Ecological Culture Exploration Site on Oido Island (오이도) in Siheung City is abundant in natural resources and historic relics dating back to the prehistoric era. Shell mounds are scatted across the island, the scale of the shell mounds is the largest along the west coast and they 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 continent, and how the coastal environment along the west coast changed during the Neolithic Age.