In the Noah’s Ark narrative, pitch covered the Ark as waterproofing.
Genesis 6:14 tells Noah to make the Ark from gopher wood and to cover it with pitch inside and outside. The Hebrew wording uses a term related to covering or coating, and pitch in this context means a waterproofing substance rather than the modern musical meaning of the word.
The passage does not identify the precise chemical composition or source of the pitch. In the ancient Near East, bitumen and other resinous materials were known for sealing boats and containers, so readers often connect biblical pitch with bitumen. That association is plausible historically, but Genesis itself does not specify a refinery process or mineral deposit.
Pitch is therefore distinct from gopher wood: one is the coating and the other is the named construction material. The text gives no recipe, thickness, or method for applying the coating beyond saying that it covered both the interior and exterior.