Looks like it's not south west of anything at all... well, maybe something on that coast that is not as south west as this place. Some stray rock to the northeast of those rocks?..
However, this only concerns Western maps which, for reasons of the West not having had the yin-yang revelation and its relevance to us humans (who have our cold feet below, interfacing the earth, and our hot heads above, interfacing the Sun), counterintuitively place South (yang, the top, overhead stuff, where the Sun is in relation to everything on earth) on the bottom, and North (yin, the below, underfoot, where the sun don't shine) on top. Not so on taoist maps. In the canonical taoist Luoshu layout southwest is not far from where that South West Rocks is... perhaps a feng shui master was the one who named that place?
In any event, I feel compelled to insert an interlude depicting a delightful case of a Western influence on a member of an Eastern culture. (They are not all delightful IMO, far from it... but this one is.)