Can you explain the question better
You would go upstream as in north if you would go down stream it would be south
Four oceans are at least partially located in the Western Hemisphere: the Arctic (which encases the Arctic Circle at the northernmost points of the world), the Southern Ocean (which surrounds Antarctica at the southernmost points of the world), the Atlantic Ocean (which separates North and South America from Europe and Africa), and the Pacific.
The only ocean that is located entirely in the Eastern Hemisphere is the Indian Ocean.
hope this helps.
