Valley sundam:
Sundam is located five kilometers northwest of Cheorwon-gun (a suburb of South Korea) and it is one of the most beautiful valleys among the branches of the Hantangang River. It has views of fascinating rock-formations, steep cliffs and ponds.
Lumion:
Valley Sundam picture[ONLINE] Available at: http://blog.daum.net/wonkil6201/1518
Valley Sundam description[ONLINE] Available at:
https://english.visitkorea.or.kr:1001/enu/SI/SI_EN_3_1_1_1.jsp?cid=791712