Final answer:
The river in which Jesus was baptized was the Jordan River, which holds significant religious importance in Christianity.
Step-by-step explanation:
The river in which Jesus was baptized was the Jordan River. According to the Bible, John the Baptist baptized Jesus in the Jordan River (Matthew 3:13-17, Mark 1:9-11, Luke 3:21-22). The Jordan River is mentioned in this context multiple times and holds significant religious importance in Christianity. It is located in the Middle East, specifically in the region of ancient Mesopotamia.