This river flows down into the Taiwan Strait./"from/in" the Longman Dictionary
This river flows down into the Taiwan Strait.
-My teacher said “down” here is redundant because a river surely flows DOWN into the sea, not UP into the sea. But, I found a sentence in the Oxford English Dictionary like this－“It’s here that the river flows down into the ocean.” Apparently, the expression of “a river flows down into a sea or any ocean” is OK. Do you agree?
(1)THE Longman Dicionary says...
(2)I learned a new word "from/in" THE Longman Dictionary.
-Which preposition is correct? Should I add an the before "Longman Dictionary"?