The Bezos Earth Fund is working with them (those the post says oversee one of the most diverse regions on earth) to help create the largest (post truncated).

Judged as of 2021-11-02. The post is truncated, so the test is the full original post and the activity it describes. True: as of that date, the Bezos Earth Fund was working with (funding or partnering with) the Indigenous leaders or groups named in the post to help create the 'largest' thing the full post names (e.g., the largest protected or conserved area of its kind), and the description matches the Fund's announcements or partner records. Mostly true: the collaboration existed as described, with a minor slip in a detail such as the exact partners or how the 'largest' superlative is scoped. Mixed: the Fund was involved, but the 'largest' superlative or the role of Indigenous leaders is substantially overstated. Mostly false: the Fund only pledged money in general terms, or had no actual working relationship with those leaders on that project at the time. False: evidence shows the Fund had no involvement with that effort as of the date. If the full post text cannot be recovered, the claim is unresolvable.

Set before the research began.

1. E1 World leaders, corporations at COP26, take major step to restore and protect forests UN News · 2 November 2021

   “The COP26 co-hosts presented the Congo Basin Pledge, which has been signed by over 10 countries, the Bezos Earth Fund and the European Union to mobilize $1.5 billion to protect forests, peatlands and other critical carbon stores.”

2. E2 World leaders, corporations at COP26, take major step to restore and protect forests UN News · 2 November 2021

   “Several indigenous leaders from various part of the world reacted to the Glasgow Forest and Land Pledge during the event.”

3. E3 Bezos Earth Fund Announces $443 Million in Grants to Advance Environmental Justice, Conserve and Restore Nature, and Improve Monitoring and Accountability PRNewswire (SOURCE Bezos Earth Fund) · 6 December 2021 Own record

   “At COP26, the Bezos Earth Fund joined the Indigenous Peoples and Local Communities (IPLC) Pledge that has been made by public and private donors.”

4. E4 Expanding Protected Areas in the Tropical Andes Through Local and… Bezos Earth Fund · 31 October 2022 Own record

   “Rainforest Trust will support the creation of six million hectares of new or expanded protected or conserved areas by 2025 in the Andes and Western Amazon by re-granting and matching 85% of Bezos Earth funding to local organizations and Indigenous Peoples groups that steward protected and conserved areas.”

5. E5 Bezos Earth Fund Announces $443 Million in Grants to Advance Environmental Justice, Conserve and Restore Nature, and Improve Monitoring and Accountability Bezos Earth Fund · 6 December 2021 Own record

   “A $5 million grant will also support the planning of the world’s largest transnational marine-protected area in the Galapagos and Eastern Pacific. This initiative was announced at COP26 by the heads of state of Ecuador, Colombia, Panama, and Costa Rica.”

6. E6 Bezos Earth Fund Announces $443 Million in Grants to Advance Environmental Justice, Conserve and Restore Nature, and Improve Monitoring and Accountability Bezos Earth Fund · 6 December 2021 Own record

   “The Global Alliance of Territorial Communities (GATC) thanks the Bezos Earth Fund for daring to support land tenure rights and management, as a clear understanding that Indigenous peoples are strategic partners to protect at least 30% of the planet for people, biodiversity, and to tackle the climate crisis,”

7. E7 Bezos Earth Fund Announces $443 Million in Grants to Advance Environmental Justice, Conserve and Restore Nature, and Improve Monitoring and Accountability Bezos Earth Fund · 6 December 2021 Own record

   “Grants totaling $25 million announced today will support the creation of an innovative global mechanism proposed by the Global Alliance of Territorial Communities to provide direct support for IPLC groups, working with the Rights and Resources Group and the Campaign for Nature.”

8. E8 Bezos Earth Fund Announces $443 Million in Grants to Advance Environmental Justice, Conserve and Restore Nature, and Improve Monitoring and Accountability Bezos Earth Fund · 6 December 2021 Own record

   “To advance conservation in the Tropical Andes, 11 grants were made totaling $151.05 million for the creation of more than 48 million hectares of newly protected areas.”

9. E9 Governments and private funders announce historic US$1.7 billion pledge at COP26 in support of Indigenous Peoples and local communities - Ford Foundation Ford Foundation · 1 November 2021

   “as part of the Protecting our Planet Challenge members, Arcadia, Bezos Earth Fund, Bloomberg Philanthropies, Gordon and Betty Moore Foundation, Nia Tero, Rainforest Trust, Re:wild, Rob and Melani Walton Foundation and the Wyss Foundation.”

10. E10 Bezos, Bloomberg among donors committing $5b to protect biodiversity Mongabay · 24 September 2021

    “The fund will support various conservation projects in places like Africa, Asia and Latin America, including land titling for Indigenous territories, the creation of government-protected areas, and land purchases for private reserves, among other projects, the Rainforest Trust told Mongabay.”

11. E11 Protecting the World’s Largest Contiguous Territories of Uncontacted… Bezos Earth Fund · 3 November 2025 Own record

    “Deep in the Amazon rainforest, two areas flanking the Brazil-Peru border form the world’s largest contiguous territories of indigenous peoples that are yet to establish contact with the outside world.”

12. E12 Tropical Pacific Ocean Bezos Earth Fund · 24 October 2022 Own record

    “That is why the Bezos Earth Fund works alongside governments, Indigenous leaders, NGOs, and funding partners to advance the global 30×30 goal – protecting at least 30% of the ocean by 2030.”

The quoted post is truncated at "the largest", and none of the evidence recovers the full post, so the Indigenous leaders and the "largest" thing it names are unknown. The evidence shows the Bezos Earth Fund was involved in several COP26-era efforts: the Congo Basin Pledge (E1), the Protecting Our Planet Challenge (E9), and a grant for planning the "world's largest transnational marine-protected area" (E5). None of these can be confirmed as the project the post describes. The criteria say the claim is unresolvable if the full post cannot be recovered.