Arctic Ocean
The ocean found at 20 degrees north latitude and 180 degrees west longitude is the Pacific Ocean.
The location 3 degrees north latitude and 65 degrees east longitude lies in the Indian Ocean.
There is no city at exactly 77 degrees north latitude and 45 degrees west longitude as this location is in the Arctic Ocean, north of mainland Europe.
It is the Arctic Ocean.
Atlantic
The North Atlantic Ocean.
The North Pacific Ocean.
north atlantic ocean
It must, by definition, cover all lines of Longitude. In terms of Latitude it is further north than, say, 60 degrees.
There is no city there. It is the North Atlantic Ocean. However, if you meant 41 degrees north latitude and 29 degrees EAST longitude, then it is Istanbul, Turkey.
34 degrees North and 78 degrees west (I think)
Atlantic Ocean.