Two Great Lines of Movement
Oromo tradition holds that the expansion followed the ancestral division into two main branches: Borana and Barentu (sometimes Barentuma). These branches moved in different directions, with multiple sub-branches spreading further.
Borana Movements
The Borana generally moved south and southeast. Modern Borana Oromo, along with Guji, Arsi (in some reckonings), and related groups, descend from this branch.
Direction: South and southeast Modern descendants: Borana, Guji, Arsi (in part)
Barentu Movements
The Barentu generally moved north, east, and west. Many present-day Oromo communities — Hararghe Oromo (east), Wollo Oromo, and others — descend from Barentu lines.
Direction: North, east, and west Modern descendants: Hararghe, Wollo, many central-eastern communities
Sub-Branches
Within each main branch, multiple confederations of clans organized expansion:
| Main branch | Sub-confederations |
|---|---|
| Borana | Macha, Tulama, Guji |
| Barentu | Karayu, Humbana, Anniya |
The Macha and Tulama
Particularly important among Borana lines were the Macha and Tulama confederations, which moved into central Ethiopia. Their descendants populate western and central Oromia today.
Oral Traditions
Oromo elders preserve detailed genealogies tracing modern clans back through these branches. Scholarly reconstruction combines oral testimony with written chronicles.
Fluidity
In practice, the expansion was not neat. Clans moved, intermarried, and shifted alliances. The branch divisions provide structure, but reality was messier.
Key takeaway: Oromo expansion followed two broad branches — Borana (south/southeast) and Barentu (north/east/west) — with sub-confederations like Macha and Tulama moving into specific territories.