The most common and most likely answer to this crossword clue is the 6 letter word BALTIC which also is the latest solution we found used in New York Times in 1947.
A boundary of USSR crossword clue answers
Here's a list of possible crossword answers ranked by the most likely to least likely.
| Answer | Likelyness | Letters | 
|---|---|---|
| BALTIC | 100 % | 6 | 
Words with a meaning similar to the clue: A boundary of USSR
These words may or may not be a possible solution to this crosswords clue.- ambit
 - border
 - borders
 - bound
 - boundaries
 - bounds
 - bourn
 - bourne
 - commission
 - demarcation
 - edge
 - end
 
Crossword Answer definitions
BALTIC adjective- Of or pertaining to the Baltic region or the Baltic Sea.
 - Of or pertaining to any of the Baltic languages.
 - Of or pertaining to the Balts (the Baltic peoples).
 - Extremely cold.
 
More crossword clues leading to the same solutions
Here's a few more crossword clues - all leading to the identical solution