subregion

[ suhb-ree-juh n ]

/ ˈsʌbˌri dʒən /

a division or subdivision of a region, especially a division of a zoogeographical region.

Origin of subregion

First recorded in 1860–65; sub- + region

sub·re·gion·al, adjective

Subprovince, sub′prov-ins, n. a prime division of a province: in zoogeography, a division subordinate to a subregion.

Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) |Various
(c) The Patagonian or Fuegian subregion being almost identical.

Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 3 |Various
The Rhea is, above all other birds, a most characteristic representative of the Avifauna of the Patagonian subregion.

Argentine Ornithology, Volume I (of 2) |P. L. Sclater
Having shown this much we have next to deal with the peculiarities of the vast Palaearctic subregion.

Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7 |Various

The natural division of the subregion is that into an African and a Madagascar province.

Encyclopaedia Britannica, 11th Edition, Volume 3, Slice 7 |Various

subregion

/ (sʌbˈriːdʒən) /

a subdivision of a region, esp a zoogeographical or ecological region

subregional, adjective