To the North-West
there are four largeris the fifth largest.
To the North-East this small place has nine different kinds of ethnicity.
To the South-Westthere are six largeris the seventh largest.
To the South-East this place is only three times larger than the water within.
You will find me where threebecome onemeet at one point.
Where am I?
You are
To the North-West is the fifth largest.
Chad to the northwest is the 5th largest country in Africa.
To the North-East this small place has nine different kinds of ethnicity.
This is Eritrea, as found by Omega Krypton
To the South-West is the seventh largest.
Angola to the southwest is the 7th largest country in Africa.
To the South-East this place is only three times larger than the water within.
Malawi to the southeast is approximately 3x larger than the eponymous lake.
You will find me where three become one.
Mount Sabyinyo's summit marks the point where the borders of Rwanda, Uganda and DR Congo meet.
The answer is
South Sudan?
North-West:
Four larger= Chad, Nigeria, Niger, Algeria
North-East:
Eritrea, the nine ethnic groups are Afar, Bilen, Hidarb, Kunama, Nara, Rashaida, Saho, Tigre, and Tigrina
South-West:
Six larger= DR Congo, Namibia, Angola, Zambia, South Africa?, last one???
South-East:
Uganda? Although the statistics say that the water area is just about 15% of the total country area, it seems a lot larger than that.
Three become one:
Somewhat related from independence from Sudan?
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$\begingroup$ Why are you counting those specific countries to the northwest? It seems like there are a couple of other roughly equally plausible candidates. $\endgroup$ – Gareth McCaughan♦ Oct 26 '18 at 16:54
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$\begingroup$ Just as accurate as possible... I know there are a lot more choices, just choosing the best ones $\endgroup$ – Omega Krypton Oct 27 '18 at 2:30
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1$\begingroup$ You have one answer correct, I think you've misunderstood the meaning of the "larger" lines. Will update $\endgroup$ – AHKieran Oct 29 '18 at 8:38