Genesis 6:15

And this is the fashion which thou shalt make it of: The length of the ark shall be three hundred cubits, the breadth of it fifty cubits, and the height of it thirty cubits.

1. God specified the size of the ark for Noah.
2. The ark was to be built 300 cubits (approximately 450 ft.) long, 50 cubits (approximately 75 ft.) wide, and 30 cubits (approximately 45 ft.) high.