All of Jerusalem, all of the regions of Judea, and the whole area around the Jordan went out to [John], and they were baptized by him in the Jordan River as they confessed their sins. 

The Story of Jesus 4.1

[Adapted from Mt 3:5-6; Mk 1:5]

The Jordan River winds its way southward from the Sea of Galilee to the Dead Sea, through a rift valley that runs into northern Africa. It descends to one of the lowest elevations on earth, dropping to almost 400 meters below sea level by the time it reaches the Dead Sea. As a large river, the Jordan served as a formidable obstacle in ancient times and the shallow sections where crossing on foot was possible were important military strongholds. The Jordan River was the eastern border of Israel’s promised land and Joshua records that the water miraculously parted as Israel crossed it to begin their campaign of conquering the land. 

Scripture passages, map, and contextual information are adapted from The Story of Jesus: All Four Gospels In One (Study Bible)