There are many similarities between the Gilgamesh flood account and biblical flood account (Genesis 6–8), beginning most importantly with God choosing a righteous man to build an ark because of an impending great flood. In both accounts, samples from all species of animals were to be on the ark, and birds were used after the rains to determine if flood waters had subsided anywhere to reveal dry land. There are other similarities are there between the Gilgamesh flood account and biblical flood account.
One major point of clear agreement is that a global flooding disaster occurred in ancient times. Portions of the Gilgamesh account (Chaldean Flood Tablets) have been found dating back to 2000 B.C. or earlier. Tablets containing the full story, however, date to approximately 650 B.C., or well after the Genesis account (c. 1450–1410 B.C.) These Chaldean tablets, from the city of Ur (modern day Southern Iraq), describe how the Babylonian God Ea decided to end all life except for the ark dwellers with a great flood. Ea, believed by the Babylonians to be the god who created the earth, selected Ut-Napishtim (or Utnapishtim) to construct a six-story square ark.
During the mid-nineteenth century, this complete “Epic of Gilgamesh” (from 650 B.C.) was unearthed in some ruins at Nineveh’s great library, and the depth and breadth of similarities and differences became evident. Here is a more extensive listing of the similarities and differences:
• God (or several gods in the Gilgamesh account) decided to destroy humankind because of its wickedness and sinfulness (Genesis 6:5–7).
• A righteous man (Genesis 6:9) was directed to build an ark to save a limited and selected group of people and all species of animals (Noah received his orders directly from Jehovah God, Utnapishtim from a dream).
• Both arks were huge, although their shapes differed. Noah’s was rectangular; Utnapishtim’s was square.
• Both arks had a single door and at least one window.
• A great rain covered the land and mountains with water, although some water emerged from beneath the earth in the biblical account (Genesis 7:11).
• Biblical flooding was 40 days and nights (Genesis 7:12) while the Gilgamesh flood was much shorter (six days and nights).
• Birds were released to find land (a raven and three doves in the biblical account (Genesis 8:6–12); a dove, swallow, and raven in the other).
• After the rains ceased, both arks came to rest on a mountain, Noah’s on Ararat (Genesis 8:4); Utnapishtim’s on Nisir. These mountains are about 300 miles apart.
• Sacrifices were offered after the flood (Genesis 8:20).
• God was (or gods were) pleased by this (Genesis 8:21), and Noah and Utnapishtim received blessings. Noah’s was to populate the earth and have dominion over all animals (Genesis 9:1–3); Utnapishtim’s was eternal life.
• God (or the many gods) promised not to destroy humankind again (Genesis 8:21–22).
Perhaps most interesting is how the stories remain consistent over time. Although the complete Epic was discovered in the mid-nineteenth century, much earlier segments (before the writing of Genesis) have been discovered and dated. Yet most significant is the greater fidelity of the Hebrew account. This is attributed to the importance of Jewish oral tradition and the possibility that some of the story was recorded by Noah or from his time, which would make the Hebrew account precede the Babylonian version.
Some scholars hypothesize the Hebrews borrowed the Babylonian account, but no conclusive proof has been offered to support this. Based on the many and varied differences and details within these stories, it seems unlikely that the biblical version depended upon an existing Sumerian source. Further, given the Jews’ reputation for passing down information scrupulously from one generation to another and maintaining a consistent reporting of events, Genesis is viewed by many as far more historical than the Epic of Gilgamesh, which is regarded as mythological because of its numerous gods and their interrelationships and intrigues in deciding the fate of humankind.
Certainly, for those who believe the Bible is God’s Word, it is sensible to conclude He chose to preserve the true account in the Bible through the oral traditions of His chosen people. By God’s providence, Jews kept this account pure and consistent over the centuries until Moses ultimately recorded it in the Book of Genesis. The Epic of Gilgamesh is believed to contain accounts which have been altered and embellished over the years by people not following the God of Abraham, Isaac, and Jacob.
 Got Questions Ministries. (2010). Got Questions? Bible Questions Answered. Bellingham, WA: Logos Bible Software.