Q-Bam Borderpool Improvement and Core Thread

I'm gonna be that guy (gal) that makes a request, because I'm much too lazy. But, could somebody with a kind heart please do the eastern Mississippi River drainage basin (includes Tennessee and Ohio, actually it would probably be a good idea to even split them)? Many thanks!
Speaking of drainage Basins, we have collectively forgotten about a thread for this stuff: the Q-bam geographic maps thread
 
Speaking of rivers, I'd like to request for the Volga River to be added to the borderpool. How could the borderpool not include the Volga River when it's literally one of the major rivers of Europe (and that the area from Voronezh all the way to Orenburg is an empty blob)?

Also, the 1920-1924 Kazakh ASSR border includes Orenburg: https://upload.wikimedia.org/wikipedia/commons/3/36/Карта_КАССР.png
I maybe forgot to post this
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Split the "Voronezh-Orenburg blob" along Federal District borders and the Volga river and gave Orenburg it's color, fixed up the colors in the Caucasus and Ukraine, added the borders for Moscow's metropolitan area.

Fixed colors in the Baltic states
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Here's an attempt at enriching the borderpool in China. Added borders correspond to the Songhua, Yellow, Huai, and Yangtze Rivers (though the outdated borders made it difficult to draw west of Wuhan), Qinling, Hulunbuir, and the area where Koreans are concentrated in China.

Added colours:
Manchuria, for Heilongjiang east of the Songhua. Rationale: This area, including Harbin, used to be part of Jilin instead of Heilongjiang.
Yanbian, for Koreans in China. Rationale: Yanbian is the autonomous prefecture for Koreans.
Nanjing, for Jiangsu and Anhui south of the Yangtze. Rationale: While Nanjing is the provincial capital of Jiangsu, most of Jiangsu still lies within the maroon area (Jiangsu colour).

For the south, I may go with the Pearl River, ethnolinguistic groups, and the Pearl River Delta region.
 
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