Analysis of information sources in references of the Wikipedia article "Air terjun Ullim" in Indonesian language version.
About 35km east of Wonsan (as the road goes) is a turning to Ullim Falls, located some 8km north of the highway down a very steep and twisted road hewn off the hillside.
“Outside of the more tourist inclined areas of (Mount Geumgang) and Ullim waterfalls [...]
Here you will experience the charm of the country’s scenic beauty, including the Ullim Waterfall, Coastal Park, Mount Kumgang and Lagoon Sijung.