The correct answer to this open question is the following.
Unfortunately, you did not attach the map. So without that map, we do not know exactly what you are talking about.
However, doing some research, we can comment on the following.
The seas that or surrounded the Mongol Empire were the Pacific Ocean on one side, the Yellow Sea, the South China Sea, and the Arabian Sea.
This powerful empire was founded by the feared Genghis Khan in 1206. The Mongol Empire quickly spread all over the region due to conquest. It became the largest empire of its time, reaching places such as China, Tibet, and faraway regions like the Middle East, and Siberia.