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Covers the "Rift-Valley" reference area (composed of sets not covered by any phylozone).
Comprising 4 sets of languages (= 7 outer languages) spoken by hunter-gatherer or former hunter-gatherer communities in Northeast Africa, along the Rift Valley.
Set 07-A has a hypothetical link to languages in the 1=Afro-Asian phylosector. Set 07-B forms part of the "East Sudanic" hypothesis (with languages in zones 04= and 05=). Sets 07-C and 07-D are parts of the "wider Khoisan" hypothesis (with languages in zones 08= and 09=).