Guinea-Bissau is bordered by Senegal to the north and Guinea to the south and east, with the Atlantic Ocean to its west. It lies mostly between latitudes 11° and 13°N (a small area is south of 11°), and longitudes 13° and 17°W.
What country is on the south border of Guinea-Bissau? (If the question is unanswerable, say "unanswerable")
Guinea