Lowest point on Earth.
After the Romans were defeated by the Persians the Quran correctly predicted that they shall be victorious again. This battle took place near the Dead Sea.
[Quran 30.2-3] The Romans were defeated in the lowest of land (أَدْنَى) they will be, after this defeat, victorious again.
Adna in Arabic أَدْنَى has two meanings: the nearest and the lowest. Today we know that the Dead Sea is the lowest point on Earth (423 m or 1388 ft. below sea level).