Knowledge and Innocence of Jordan

"And they camped by the Jordan." Rabbah bar bar Channah said to me: "I saw a certain place that was three parasangs away." "When you cross the Jordan into the land of Canaan" - Rabbi Yehuda ben Beteira says: "The phrase 'Canaan' refers to the land of Canaan, not the Jordan." Rabbi Shimon ben Yochai says: "Behold, it says, 'Beyond the Jordan,' which means the land of Canaan extends as far as the Jordan." Rabbah bar bar Channah said in the name of Rabbi Yochanan: "The Jordan only flows from Jericho and southward." For what halachic purpose? If we say it is referring to a vow, it follows the language of people, and wherever they call it the Jordan, it is forbidden [to bring tithes there]. Rather, it is referring to tithing of animals. It is also taught similarly: The Jordan flows from the cave of Pamias and passes through the Sea of Sivhah, the Sea of Tiberias, and the Sea of Sodom, and it empties into the Great Sea. The Jordan is only from Jericho and southward. Rabbi Chiya bar Acha said: Why is it called Jordan? Because it descends from Dan. Rabbi Abba said to Rav Ashi: Do we learn it from here? But it is written: 'They called it Dan,' etc. Rabbi Yitzchak says: It was named Pamyas. And it is taught in a Baraita: The Jordan flows from the cave of Pamias.