According to Genesis, what was the Ark's only opening for entering it?

According to Genesis, Noah's Ark had a door in its side. Genesis 6:16 describes the vessel's structure and says that the Ark's entrance was to be placed in its side.

The same verse mentions a window and several levels, but it distinguishes the door from those features. Genesis later says that God shut Noah in after he entered, making the doorway an important part of the Flood narrative. The text does not describe the door's shape, material, hinges, or exact location along the side.

Artists and films often portray the Ark with a large frontal ramp or a prominent gate at the bow. That is a visual interpretation rather than a detail stated in Genesis. The biblical description is brief: one door is specified, and its position is given as the side of the vessel.