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Environmental Defenders Office
June 3, 2025

Mabo Day

Today is Mabo Day, and the final day of this year’s National Reconciliation Week. 

Today we commemorate Eddie Koiki Mabo, a Meriam man from the island of Mer (Murray Island) in the Torres Straits, alongside his family and community for their decade-long fight to overturn the doctrine of ‘terra nullius’, or ‘land belonging to no-one’ in Australia.  

Their courage and determination led to the historic landmark 1992 High Court decision which affirmed that Native Title does exist, and that Aboriginal and Torres Strait Islander peoples hold rights to land and waters that pre-date colonisation.   

The following year the Native Title Act 1993 (Cth), was enacted, paving the way for claims by Aboriginal and Torres Strait Islander peoples to their traditional rights to land and compensation.  By April 2025 there have been 647 Native Title Determinations across Australia.  

The Mabo decision remains fundamental to legal, cultural heritage and environmental work today and is pivotal in EDO’s work for First Nations. 

Mabo Day reflects the principles we strive to uphold every day: justice, land rights, self-determination and genuine commitment to working on behalf of First Nations clients and communities.  

It reminds us that our legal and advocacy work, whether through supporting free, prior and informed consent in cultural heritage law reform, supporting Indigenous Protected Areas, or casework on behalf of Traditional Owners, is part of a broader movement towards rights, truth-telling, self-determination, and stronger outcomes for First Nations peoples’ Country and Culture.  

Mabo Day is more than a historic milestone; it is a call to continue working for justice, to listen deeply, and to ensure that First Nations leadership continues to shape the future of Australia. 

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Authorised by David Morris, Environmental Defenders Office Ltd, Suite 8.02 Level 8, 6 O’Connell St, Sydney NSW 2000 • ABN: 72 002 880 864

Postal Address:
PO Box R1105 Royal Exchange NSW 1225


EDO recognises the traditional owners and custodians of the land, seas and rivers of Australia. We pay our respects to Aboriginal and Torres Strait Islander elders past and present, and aspire to learn from traditional knowledge and customs so that, together, we can protect our environment and cultural heritage through law.