<P> The Great Rift Valley as originally described was thought to extend from Lebanon in the north to Mozambique in the south, where it constitutes one of two distinct physiographic provinces of the East African mountains . It included what we would call today the Lebanese section of the Dead Sea Transform, the Jordan Rift Valley, Red Sea Rift and the East African Rift . </P> <P> Today these rifts and faults are seen as distinct, although connected . These were only formed 35 million years ago . </P> <P> The northernmost part of the Rift corresponds to the central section of what is called today the Dead Sea Transform (DST) or Rift . This midsection of the DST forms the Beqaa Valley in Lebanon, separating the Lebanon from the Anti-Lebanon Mountains . Further south it is known as the Hula Valley separating the Galilee mountains and the Golan Heights . </P> <P> The River Jordan begins here and flows southward through Lake Hula into the Sea of Galilee in Israel . The Rift then continues south through the Jordan Rift Valley into the Dead Sea on the Israeli - Jordanian border . From the Dead Sea southwards, the Rift is occupied by the Wadi Arabah, then the Gulf of Aqaba, and then the Red Sea . </P>

What type of boundary is the great rift valley