Download coordinates as: Undullah is a rural locality split between the City of Logan and the Scenic Rim Region, Queensland, Australia.

[1] Undullah is dominated by the Flinders Peak Group which rises towards its western boundary.

Within the locality are the following mountains (from north to south): Woollaman Creek, a tributary of Teviot Brook, is the major waterway in the suburb.

[10] The Undullah is believed to be the word nandulla from the Bundjalung and/or Yuggera languages meaning the silver leafed iron bark (eucalyptus melanophloia).

[11] Formerly in the Shire of Beaudesert, Undullah was split between Logan City and Scenic Rim Region following the local government amalgamations in March 2008.