Crossword puzzle clue "mythical boundary river"

Here are the possible solutions for mythical boundary river clue

Answer
Clue
Relevancy
styx
Clue
Mythical boundary river
acre
Clue
Brazilian boundary river
Brazil-Bolivia boundary river
Definition
a measure of land equivalent to 4840 square yards
amur
Clue
Asian boundary river
Russia/Manchuria boundary river
U.S.S.R.-China river boundary
Manchurian boundary river
China-Russia boundary river

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