Surah Al-Kahf Verse 61 - English Translation by Literal
Surah Al-Kahfفَلَمَّا بَلَغَا مَجۡمَعَ بَيۡنِهِمَا نَسِيَا حُوتَهُمَا فَٱتَّخَذَ سَبِيلَهُۥ فِي ٱلۡبَحۡرِ سَرَبٗا
So when they (B) reached (a) place of meeting (point of joint) between them (B) (the two seas/oceans/rivers), they (B) forgot their (B)`s fish/large fish/whale, so it took/received its path in the sea/ocean/river sneaking away (it escaped into the body of water)