Final answer:
The 6th Fleet is responsible for the Mediterranean Sea and Black Sea, located in the vicinity of Europe, Africa, and Asia.
Step-by-step explanation:
The 6th Fleet is responsible for the Mediterranean Sea and Black Sea. The fleet's area of responsibility includes these two bodies of water, which are located in the vicinity of Europe, Africa, and Asia. This allows the fleet to support various operations in the region, such as ensuring maritime security, conducting exercises, and promoting partnerships with allied countries.