The Sangdo Lumbermill is north of Seongsan on Jeju Island and is one of two lumber mills on the map. It accepts logs from Iseungag and Migeum, cutting them into planks for delivery to building sites and The Architect.
Sangdo Corn Farm
Sangdo Corn Farm sits between Seongsan and Gujwa — a farmland that produces corn pallets for the supermarket loop.