The biblical history of humankind starts with Adam (pbuh) and Eve, and this is where we first encounter associations with the land of Jordan. Some early biblical interpretations linked Adam and Eve with the area of the Jordan River and the Jordan Valley.

They located the Garden of Eden along the banks of the Jordan River, in the northern Jordan Valley near Wadi Rayyan on the eastern bank and Baysan (Beth-shean) on the western bank of the river. This is not surprising, given the area's lush vegetation and rich animal life.

In the book of Genesis, God calls the Jordan Valley plain around the Dead Sea "the Garden of the Lord" (Genesis 13:10). Some early biblical traditions interpret the Genesis 2:10 account of a river that "flowed out of Eden to water the garden" as a description of the upper Jordan River and the Jordan Valley. After being expelled from the Garden of Eden, these traditions say, Adam stood in the waters of the Jordan River for 40 days, praying and begging forgiveness
from God.

Other early biblical interpretations suggested that when Cain killed his brother Abel and was banished by God to the area "east of Eden" (Genesis 4:16), he went to one of three sites east of the Jordan River that would later be designated as Cities of Refuge. A person accused of involuntary manslaughter could seek refuge in the one of these cities until he or she could receive a fair trial.

The next major biblical figure linked with Jordan is Noah (pbuh), described as "righteous and blameless" (Genesis 6:9, Ezekiel 14:14). A tomb/shrine of Noah is locally revered at Kerak, in southern Jordan (today Kerak is best known for its massive Crusader and medieval Islamic castle).

The tomb/shrine of Noah in Jordan is an important reminder of the unbroken continuity of the shared faith principles of the Abrahamic communities from the dawn of history until today.

http://www.atlastours.net/jordan/biblical_history.html