What we have seen according to most of the authors of books of tafseer (Qur’aanic commentary) is that what is meant by the two seas here is the two well-known types of water that are found on earth: (i) rivers of fresh water (ii) seas of salty water The evidence for this interpretation is the verse in which Allah says, describing the two seas (interpretation of the meaning): “one palatable and sweet, and the other salt and bitter” [al-Furqaan 25:53]. The evidence supports the view of the majority, unlike those who say that it refers to two seas, a sea in heaven and a sea on earth, or the seas of the Persians and Byzantines, or other strange opinions of which it cannot truly be said that one of them is palatable and sweet and the other is salt and bitter. Secondly: With regard to the barrier between the two seas that is mentioned in these verses, there are two scholarly views concerning it: