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coastal migration
In anthropology and genetics, coastal migration is the theory that 100–200 thousand years ago, early human migrations first spread eastwards from a single origin in Africa to areas outside Africa, predominantly along coastal routes.〔(Searching for traces of the Southern Dispersal ), by Dr Marta Mirazón Lahr, et al.〕 Other terms, such as southern coastal route,〔Metspalu et al 2006, (Human Mitochondrial DNA and the Evolution of Homo sapiens. )〕 rapid coastal settlement,〔 coastal migration theory and coastal migration model, are also used.
==Coastal migration theory in Asia and Oceania==
The coastal route theory is primarily used to describe the initial peopling of the Arabian peninsula, India, Southeast Asia, New Guinea, Australia, coastal China, and Japan.〔 It is linked with the presence and dispersal of mtDNA haplogroup M and haplogroup N, as well as the specific distribution patterns of Y-DNA haplogroup C and haplogroup D, in these regions.〔 The theory proposes that humans, likely similar to the Negritos or Proto-Australoids of modern times, arrived in the Arabian peninsula from Africa, then on the southern coastal regions of the Indian mainland, followed by spread to the Andaman Islands and modern-day Indonesia, and thence branching southwards to Australia and northwards towards Japan. National Geographic's Genographic Project uses the term 'Coastal Clan' to describe the initial human groups of Y-DNA haplogroup C who expanded eastwards out from Africa along the coastal route around 50 kybp.
Roger Blench discusses the theory in relation to language families.〔http://www.rogerblench.info/Archaeology%20data/World/Manila%202006/Indian%20Ocean%20settlement%20paper%202006.pdf The Pleistocene settlement of the rim of the Indian Ocean〕
Many centuries later, the ancestors of the Malagasy people are believed to have migrated coast-wise along the same route, but in the opposite direction (viz. westward along the shores of the Indian Ocean).
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