Make yourself an ark of gopher wood. Make rooms in the ark, and cover it inside and out with pitch. This is how you are to make it: the length of the ark 300 cubits, its breadth 50 cubits, and its height 30 cubits (Genesis 6:14-15). The Big Boat The dimensions of the ark were about 450 feet long, by 75 feet wide, by 45 feet high. Such a huge vessel would have had a total storage capacity of almost one and a half million square feet.