Bottom of the North Atlantic Ocean
The Amazon ends in Brazil, and empties into the Atlantic Ocean.
There's no country there. That point is out in the north Atlantic Ocean, about 285 miles southeast of Halifax, Nova Scotia, and about 575 miles due east of Montauk Point at the end of Long Island, New York.
You would probably end up in the middle of the Atlantic ocean.
Atlantic Ocean
The Atlantic marks the western end of Europe. Many European countries have Atlantic coastlines. Their international boundaries would include part of the Atlantic Ocean, so parts of the Atlantic are in Europe.
To the west of the Atlantic Ocean are the continents of North and South America. You would end up 600 miles inland on one or other of these continental land masses.
The North Channel, which is the northern end of the Irish Sea, connecting it to the Atlantic Ocean.
No. While the ocean is uniquely named after the country, the Ocean itself does not belong to India. Away from the territorial costal region all oceans are the "high seas" and are not the territory of any one country.
The Atlantic Ocean is to the west of Ireland and the Irish Sea is to the east. However there are other seas around Ireland. St. George's Channel and The North Channel are at either end of the Irish Sea, and the Celtic Sea is part of the Atlantic, just south of Ireland.
It Starts in the Central African Rep. It Ends In the Atlantic Ocean
The Panama Canal connects the Atlantic Ocean to the Pacific Ocean, and the distance between the Atlantic end (near Colón) and the Pacific end (near Balboa) is approximately 50 miles. Therefore, the Pacific Ocean is about 50 miles east of the Atlantic end of the canal.