Cross reference
Genesis 6:15
15 And this is how thou shalt make it: the length of the ark three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.
Genesis 7:20
20 Fifteen cubits upward did the waters prevail; and the mountains were covered.
Deuteronomy 3:11
11 (For only Og king of Bashan remained of the remnant of the Rephaim; behold, his bedstead was a bedstead of iron; is it not in Rabbah of the children of Ammon? nine cubits was the length thereof, and four cubits the breadth of it, after the cubit of a man.)