Since you did not specify the direction of longitude, the country located at 20 degrees south latitude and 140 degrees east longitude is Australia, while the country located at 20 degrees south latitude and 140 degrees west longitude is France. The location is French Polynesia, which is a French territory.
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Japan
There is no country at the coordinates 80 degrees south latitude and 140 degrees west longitude. It is a point on the continent of Antarctica.
Japan
Tokyo, Japan is near 35.7° N, 139.7° W.
The sea located at 73 degrees north latitude and 140 degrees west longitude is the Chukchi Sea, which lies between Alaska and Russia in the Arctic Ocean.
In the middle of the Pacific
Asia
technically sea but near Indonesia
The North Pacific Ocean.