In Genesis, what was the lowest deck of Noah's three-level Ark called?

In Genesis, the lowest level of Noah’s three-level Ark is called the lower deck.

Genesis 6:16 instructs Noah to make the ark with lower, second, and third decks. The verse is a structural description rather than a detailed account of how each level was used. It also mentions a roof, a door in the side, and a window or opening, depending on translation.

The biblical text does not provide a complete floor plan or assign particular animals to particular decks. Modern illustrations often show organized stalls, storage areas, and walkways, but those arrangements are artistic or speculative additions. What Genesis states directly is the existence of three levels and their relative order.

The deck detail contributes to the ark’s image as a large, compartmentalized vessel. It is separate from the ark’s overall dimensions—300 cubits long, 50 cubits wide, and 30 cubits high—and from the later account of its landing on the mountains of Ararat.