Final answer:
The Mediterranean Sea separates Africa from Europe, the Sahara Desert extends from the Atlantic Ocean to the Red Sea, and the river at point A is likely the Nile River.
Step-by-step explanation:
The body of water that separates Africa from Europe is the Mediterranean Sea. The Sahara Desert extends from the Atlantic Ocean to the Red Sea, and is considered the largest desert in the world. The river located at point A is most likely the Nile River, which is a prominent feature in the middle of Africa and is known for being the longest river in Africa and a crucial part of the ancient Nile River Civilization.