Where was the Garden of Eden and why did God need to rest on the seventh day of creation?

Genesis 2:2 "By the seventh day God had finished the work he had been doing; so on the seventh day he rested from all his work."

Genesis 2: 8 - 14 "Now the Lord God had planted a garden in the east, in Eden; and there he put the man he had formed. The Lord God made all kinds of trees grow out of the ground—trees that were pleasing to the eye and good for food. In the middle of the garden was the tree of life and the tree of the knowledge of good and evil. A river watering the garden flowed from Eden; from there it was separated into four headwaters.  The name of the first is the Pishon; it winds through the entire land of Havilah, where there is gold. (The gold of that land is good; aromatic resin[d] and onyx are also there.) The name of the second river is the Gihon; it winds through the entire land of Cush. The name of the third river is the Tigris; it runs along the east side of Ashur. And the fourth river is the Euphrates.

The Bible just states that God did rest, not that God needed to rest, as if he were exhausted. God doesn't run out of energy or get worn out from hard effort as humans do. Nonetheless, using the seventh day as a day of rest demonstrates the value of relaxation. God's rest also enlightens us to the necessity of our own Sabbaths (Exodus 20: 8 -11). God gave us the fourth commandment for our own good, but by keeping it Himself, God also gave it the divine seal of approval.

Garden of Eden: Although its exact location is unknown, the Bible appears to place it close to the point where the rivers Tigris and Euphrates, otherwise known as the Fertile Crescent in ancient times. That region is now in southern Iraq.