Good sized manmade wall near the Dokdo museum.
Holds are a little dodgy and rotate easily.
From the ferry terminal in Ulleung eup go up the main road until you see an arch above a road to the left.
Go up that road for about 5 minutes until you see a temple to your left. Go right up the path and you'll see the wall on your left.
Shops nearby. Had shade. Looks pretty unused.