Joênia made history in 2008 when she argued a case brought by five indigenous groups to have their land officially demarcated as an Indigenous Territory, a type of tenure that confers indigenous peoples inalienable rights over their traditional homelands.
Joênia ṣe àfikún ìtàn ní ọdún-un 2008 nígbà tí ó gba ẹjọ́ ẹgbẹ́ ìbílẹ̀ márùn-ún kan rò, pé kí wọn ya ilẹ̀ẹ wọn sọ́tọ̀ gẹ́gẹ́ bí ilẹ̀ abínibí, irú òfin tí yóò fún àwọn abínibí ilẹ̀ náà ní ẹ̀tọ́ láti pàṣẹ lórí àwọn ilẹ̀ ìlúu wọn.