Mexico
Russia
Mexico
We also need to know the longitude to position your "nation" on the planet because the 20 degrees north latitude goes right round the planet.
That point is in western Botswana, about 24 miles west of Maun.
-- If you meant 30 degrees WEST longitude, then that point is way out in the north Atlantic Ocean, between Ireland and Newfoundland. -- If you meant 30 degrees EAST longitude, then that point is in Ukraine, about 38 miles southwest of the center of Kiev.
ICELAND
The Philippines.
Guatemala
The nation that stretches from 18 degrees south latitude to 53 degrees south latitude is Argentina. It is located in South America and is known for its diverse geography, which includes mountains, plains, and a long coastline along the Atlantic Ocean. Argentina is the eighth-largest country in the world and has a rich cultural heritage.
There is Taiwan island, a bit higher than 23N latitude, but now it is not a nation. Taiwan is territory of China.
Probably iceland