HELP!! Cant map last piece!!! PLEASE

These are 2 images of the same part.
Mine is to the left. The second one is from wiki.
I need the last piece and l will be done mapping Gwen.
If anyone knows how to open it please post.
I have been running around that area for a very long time now.
PLEASE.
If someone can take me there to map it ill be giving a cash reward.
Matrix the Shadow.

i finished mapping gwen, you cant get that part, teh image from wiki is from a picture some one took in text mod, there are many places on the world map that have fog coverd that dont count as part of the mapping