Wolfcam's Geography Challenge #10

Name the body of water that comes next in the pattern. Put the answer and explanation in the comments.
Congratulations to Scambigol (2), Joez (3), Flabberbapper, Mahble, and Kempo for solving the other ones.
Challenge #9 is unsolved, you can find it here
Congratulations to RG1227 for solving this one!
Quiz by WolfCam
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Last updated: December 15, 2017
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First submittedNovember 30, 2017
Times taken14
Average score100.0%
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Answer
Sea of Japan
=
2
Black Sea
=
5
Caribbean Sea
=
1
Correct!
=
5
+1
Level 68
Nov 29, 2017
Easy! It's the Black Sea! =)
+1
Level 66
Nov 30, 2017
Nice Try! But no
+1
Level 76
Nov 30, 2017
number of international borders on the coastline?
+1
Level 66
Nov 30, 2017
I don't believe so.
+1
Level 77
Nov 30, 2017
It's not the number of major rivers flowing into them, is it?
+1
Level 68
Nov 30, 2017
I think it is...
+1
Level 77
Dec 2, 2017
I feel like it's going to be a proportion...
+1
Level 66
Dec 2, 2017
Hint. It does have to do with the countries bordering them.
+1
Level 77
Dec 9, 2017
Uhhh.... I've been thinking about this for ages...
+1
Level 66
Dec 9, 2017
Think more about some former countries.
+1
Level 68
Dec 10, 2017
Your not the only one mahble...
+1
Level 77
Dec 13, 2017
... But Spain didn't own EVERYTHING around the Caribbean... I don't see what else...
+1
Level 66
Dec 13, 2017
*cough cough* Soviet Union *Cough cough*
+1
Level 77
Dec 14, 2017
Number of countries affiliated with the Soviet Union?
+1
Level 77
Dec 14, 2017
Is it # of countries bordering that were involved in World War II during WWII?
+1
Level 66
Dec 14, 2017
Nope. What do you think of when thinking of Soviet Union
+1
Level 68
Dec 15, 2017
COMMUNISTS!!!!!! The black sea has 5 communist bordering it(former ussr,bulguria,and hungary) sea of japan has 2 (former ussr and north korea) and carrabien has 1!( Cuba)
+1
Level 68
Dec 15, 2017
BTW the answer is Baltic because of estonia,latvia,luthniania,poland, and russia
+1
Level 66
Dec 15, 2017
Yay! Good Job! I was thinking Adriatic but Baltic works too.
+1
Level 66
Dec 15, 2017
There's a new hint on #9 if you want to try that
+1
Level 77
Dec 15, 2017
Now I feel stupid... Communism... USSR... DUHHHHH...