need a little Cartography help

Hi everyone,

I'm trying to get an area of the map, but I can't figure out how to do it.
Can anyone help me with this?

Been a long while, but if you can't get it in the outpost, you should be able to get it by going there either at the beginning of the mission (secret path near Oink), or close to the ending of the mission, during the part in the swamp with the Undead (go as much as you can into the direction you need unfogged).

Thanks I'll try that