Guess the Country - No Starting Letter Hint?

Guess the Country - No Starting Letter Hint?

It's NO HINT time!

In alphabetical sequence, this question would typically be about a country starting with "Q". Since there's only one such country, Qatar, that would be too easy. So, instead, today there is no hint about the starting letter of this country.

Unlike the last no-hint question, all of the facts are true, there are no false facts.

Information about this country...

* This country is landlocked

* This country is very poor, 8th poorest in the world (2020)

* It was once part of its northern neighbor before achieving independence

* People have lived in its area since 20000-30000 BC

* Its flag consists of red green white blue and yellow colors

* It's one of only 27 countries that does not have a UNESCO World Heritage site

* Among all countries, it has the 8th lowest life expectancy of 57.6 years (2020)

* One of the two longest rivers in the world flows through this country

* Its athletes have won zero Olympic medals through 2022

Please don't cheat by looking it up or looking at other peoples' opinions and guesses. Make your best guess.

If you think you know what country this is, make your guess in an opinion below.

Good luck! And HAVE FUN!

The correct answer will be given in a few days (Wednesday).

Updates
1 y
This is turning out to be harder than I thought. Several did ask for a harder question, though. 😉
Updates
1 y
The correct answer is South Sudan.

Some details...
South Sudan declared its independence from Sudan in 2011, making it the newest country in teh world
The ancient area of Nubia is in part of the country
The Nile River (considered by many to be the longest river; some say the Amazon is) flows through it
Guess the Country - No Starting Letter Hint?
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