Orijangnim Forest is approximately 2 kilometers long, the same length as the Korean measurement of five ri (O-ri). It is also called Jacheon Forest due to its location near Jacheon-ri. The forest was split into two parts after a national roadway was built through the forest. Later, much of the forest was lost due to additional building construction, road expansion, and typhoon. Only some areas in front of Jacheon Village retain the old ambience.

Orijangnim Forest was established to block the strong winds from entering the village, as well as provide bank protection and flood prevention. It is comprised of 280 trees from 12 different species including oriental oaks.