Oh wow, I know its a little too late but ill tell you now for the future, you know that tattoo artists can put these press-on ink transfers on like thin paper, press them on your skin, and then tattoo over the lines it leaves and wash the "pre-ink" away. Most tattoo artists do this anyway.
So you could have taken an actual map of africa into kinkos and photocopy in on to this transfer paper, and had him/her tattoo a geographically acurate outline of the continent on your back. Did the guy/chick just freestyle the outline of africa on your back? Cuz that aint easy. Or did you want it to just "evoke" the outline of Arica and not be accurate?
Oh well, live and learn.