A yard refers to a hard and flat land that is polished to a width where people can gather and play.
There are countless rocks called Garden(Madangbawi) Rock in the mountains across the country, but I haven't seen a place as wide as Madangbawi Rock here and with good surrounding scenery.
You can see Ulsan Rock right in front of you, see the East Sea far away, and you can see downtown Sokcho at a glance.