That one completely thew me. Didn't even look vaguely familiar. I think it's because in my head Central America runs north-south, not west-east, as the joint shape appears to.
Great quiz but extremely difficult for me. (Good for my brain, though.) I went back later and saw different shapes. Guatemala and Honduras look like a tractor driving into a mud puddle. Saudi and UAE look like a cross between an elephant and a rhino, Bulgaria and Turkey is a kitten pulling apart a rug, Albania and Greece is a disintegrating elephant, etc.
-JanLouisJordaan
Nr 10 and Nr 15 were hard (for me)