Joshua 3 describes the miraculous crossing of the Jordan River by the Israelites, marking a pivotal moment in their conquest of Canaan. Under Joshua's leadership, the priests carry the Ark of the Covenant into the swollen river, and the waters miraculously part, allowing the entire nation to cross on dry ground. This event serves as a powerful demonstration of God's presence and power, validating Joshua's leadership and instilling both awe in Israel and fear in their enemies.