The tropics are between 23.5 south and 23.5 north.
The segments of Sub-Saharan waterways unnavigable is made of waterfalls and quick rapids make the district's streams unnavigable in many spots. Techniques being utilized as a part of Sub-Saharan Africa to invert arrive debasement incorporate is expanded soil richness, diminished utilization of compound operators, reforestation.
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1)Japan 2)South Korea 3)China 4)North Korea
Not completely sure because we don't really know anything about North Korea but this is my guess :)