What is the name of the first lead of the river that parted in the Garden of Eden?

The name of the first lead of the river that parted in the Garden of Eden is Pison, according to the book of Genesis in the Bible. The Garden of Eden is described as a paradise where the first humans, Adam and Eve, lived. The Bible states that a river flowed out of the garden and then divided into four heads or branches. These four rivers are named as Pison, Gihon, Hiddekel (Tigris), and Euphrates. Pison is believed to be the first of these rivers, and it flowed around the whole land of Havilah, where there was gold, bdellium, and onyx stones. It is important to note that the exact location of the Garden of Eden and its four rivers is unknown, and there are different interpretations and theories about their identity and location. However, according to the Bible, Pison is the name of the first river that parted in the Garden of Eden.