Mainly on the periphery (southern Goday, Afdheer, Liibaan, Hararghe) but HG have always accessed the Haud (Warheer area) in the dry seasons.
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Hawiya doesn't make up the majority in the big towns like Jigjiga, Dhagaxbuur etc which were Ethiopian outposts in the past, this is why many underestimate their regional numbers. Historically, it was our original homeland (our ancestor is buried in Baabile) and we shed blood for it many times.
SOURCE
Congresso geografico italiano - 1894