In Genesis, what part of Noah's Ark provided its main entrance?

In Genesis, Noah's Ark had a door in its side as its main entrance.

Genesis 6:16 gives the construction instructions and says that the ark was to have a door in its side. The verse places this detail alongside the ark’s roof and three levels. Genesis 7:16 later says that, after Noah and the animals entered, the Lord shut him in, linking the door with the transition into the Flood.

Popular illustrations often show large ramps, multiple gates, or openings in the roof, but those features are not specified in Genesis. The text identifies one door and locates it in the side of the vessel. It does not provide a detailed description of the door’s dimensions, hinges, locking mechanism, or boarding ramp. This concise architectural detail is one of the few explicit statements about how the ark was entered.