Great Rift Valley Great Rift Valley The Great Rift Valley is a continuous geographic trench, approximately in length, that runs from Lebanon's Beqaa Valley in Asia to Mozambique in Southeastern Africa. The name continues in some usages, although it is today considered geologically imprecise as it combines features that are today regarded as separate, although related, rift and fault systems. Today, the term is most often used to refer to the valley of the East African Rift, the divergent plate boundary which extends from the Afar Triple Junction southward across eastern Africa, and is in the process of splitting the African Plate into
Chilean Central Valley region the Central Valley re-appears in the south to extend into Osorno and Puerto Montt (41°30' S). This southern section is 190 km long from north to south. The Central Valley south of Bío Bío River has been influenced by volcanism and past glaciations giving origin to the ñadis and morraines that cover parts of the valley. South of Puerto Montt the continuation of the Central Valley is made up of a series of marine basins including Reloncaví Sound, Gulf of Ancud, and the Gulf of Corcovado that separates Chiloé Island from the mainland. Further south the valley runs as