These coordinates are in international waters of the South Pacific Ocean, and are not part of any country. The nearest point of land is part of the French Overseas Collectivity of Wallis and Futuna, 100 miles away.
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.
Argentina
Madagascar
Mexico
Australia
Australia
South Africa
The country at 40 degrees south latitude and 70 degrees west longitude is Chile.
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.
When you get to 90 Degrees South you are at the South Pole....
Brazil.
Kenya.