In Genesis, what was built beside Noah’s Ark after he left it?

In Genesis, Noah built an altar after leaving the Ark.

Genesis 8:20 says that Noah built an altar to the Lord after the ground had dried and he and his family had left the ark. He then took some clean animals and clean birds and offered burnt offerings on it. This is the first altar explicitly mentioned in the Genesis narrative.

The episode marks a transition from survival to worship and is followed by God’s covenant with Noah. It also connects with the earlier distinction between clean and unclean animals, although Genesis does not provide a full classification system in this passage.

The altar was not described as a permanent building beside the ark, and the text does not say that Noah founded a city or temple there. Later retellings sometimes focus on the ark’s landing place, but Genesis’s immediate post-flood action is Noah’s construction of an altar and his offering.