YOU SAID:
Oh no! The river is going the other way
INTO JAPANESE
あらいやだ!川は逆に進んでいます
BACK INTO ENGLISH
Oh no! The river is going in reverse
INTO JAPANESE
あらいやだ!川は逆流しています
BACK INTO ENGLISH
Oh no! The river is flowing backwards
INTO JAPANESE
あらいやだ!川は逆流しています
BACK INTO ENGLISH
Oh no! The river is flowing backwards
That didn't even make that much sense in English.