Beaudesert, Logan and Albert Rivers area (Sharpe 1985). The Yugumbir territory was shaped like a right-angled triangle. The eastern boundary with the Ngaraangbal territory was a line running south from near Beenleigh, through Tamborine Mountain to Binna Burra. The southern boundary with Galibal and Gidabal territory was a line running west along the McPherson Range as far as Mount Ballow. The third side of the triangle, the boundary with Yuggera territory, ran north-east from Mount Ballow to near Beenleigh. Yugumbir territory thus contained all of the upper Albert and Logan valleys, with the exception of Teviot Brook (in Yuggera territory) and with the addition of the headwaters of the Coomera River. The boundary between Yugumbir and Yuggera has been a matter of debate. Several authorities have considered that the boundary was along the Logan River; on that view, Beaudesert and Rathdowney lie on the border. The view adopted here, however, follows the opinion of T.W.Hardcastle, who lived near Boonah and gave careful thought to the question without resolving it precisely. He stated "the natives of the Teviot Valley spoke Yug-gra-bul... The Maroon and Upper Logan aboriginies spoke Yug-um-bir. I could never find their tribal boundaries" (Steele 1984:68).