Answer:
III
Step-by-step explanation:
Germany and France are both countries that are in fully Europe. They are on the west part of the continent and also part of the European Union.
The region marked with number III on the map is Europe. Because Germany and France are positioned there, we know Blake and his family are traveling through region III of the map.
Region I on the map is North America.
Region II on the map is South America.
Region IV on the map is Asia.