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Romania touches the black sea.
Whose citizens have won at least one Nobel Laureate
Romania has won 4. One in chemistry, literature, peace, and physiology/medicine.
Has more than one UNESCO World Heritage Site
Romania has 8. Chad has 2.
Whose highest peak stands taller than 3,000 meters
Chad's highest peak is on the mountain of Emi Koussi at 3,415m while Romania's is only 2,544m on Moldoveanu Peak.
Whose lowest point is lower than sea level (0m)
Romania's lowest point is level with the black sea and Chad's lowest point is -160m at the Bodélé Depression.
One Nickname is "The Babel Tower of the World"
Chad is known by this nickname because of its extensive cultural diversity.
Was at one point controlled by the British Empire, partly or fully.
Whose country officially speaks a Romance Language
Romania speaks Romanian. Chad speaks French as a official minority language. Both are Romance languages.
Whose country was previously or currently under Communist rule
Romania was under communist rule from 1947-1989 and was a part of the Warsaw Pact.
Has a designated Underground City
Although Romania and Chad have none, they do exist in other countries!
Whose most popular sport is football (soccer)
Whose country has its own equivalent of Mount Rushmore which contains a major leader.
The rock sculpture was cut on the Danube Iron Gates and contains Decebalus, the last king of Dacia.
Contains the most coal reserves in their respective continent
Is currently a monarchy
Romania however was previously part of a monarchy.
Has at least one billionaire
Romania has two. Chad's richest person only has $50 million.
What Country's Flag is in the Thumbnail?
Chad's flag has a darker shade of blue. Sorry for ruining your 100%