단목마을 입구에 수백 년 된 물버들나무가 있었는데, 1921년 진주∼의령 간 지방도가 개통되면서 숲이 나뉘어 안숲과 바깥숲으로 부르고 있다.
At the entrance of Danmok Village, there was a water willow tree, which is hundreds of years old and when the regional road between Jinju and Uiryeong was opened in 1921, the forest was divided and called the inner and outer forests.