I don't know really when you'd say "two rivers of tears" "A river of tears" would be better, but I haven't heard too much about that...More like "cry me a river"

he cried a river, or cry me a river are correct

Hi.I am from Russia. "a river of tears" is right

I think a river of tears is right

They're both grammatically correct, but the first one sounds more natural. Although, in saying that I don't think I've actually heard it being said, but it's closer to "cry me a river" which is the only one I've heard being said.