Mapping Palau

GAO turns to Palau, a compact reef region home to about half of the world’s coral species, to map living coral and calibrate the Tanager satellites.

GAO Flies over Palau in November 2026
Status
In Progress
Mission Start
November 1, 2026
Region
Western Pacific

Mapping the Reefs That Persist


GAO is now airborne to Palau, and the team’s energy turns to science mapping. The mission is the same as every mission in the Pacific campaign, with two goals.

The first is to map the living corals of Palau in order to identify refugia, or persisting reefs. These areas will receive the greatest attention from conservation partners in the region.

The second is to calibrate the Tanager-1 and Tanager-2 satellites for Version 2.0 of the Allen Coral Atlas.

A Compact Reefscape with Outsized Diversity

Palau is a complicated reefscape, but a compact one. The distance from north to south, including all of the outer reefs, is almost identical to the length of West Hawaiʻi Island. Within that footprint it harbors about 50% of the world’s coral species.

Palau coral diversity

Confirmed and strongly predicted totals across the resulting ecoregions

415
Coral species
  • 49.9% of the global total (831)
  • 54.7% of Indo-Pacific species (758)
  • 0.0% of Atlantic species (73)
76
Coral genera
  • 62.3% of the global total (122)
  • 76.0% of Indo-Pacific genera (100)
  • 0.0% of Atlantic genera (28)
1
Ecoregion
  • 0.7% of the global total (150)
  • 0.8% of Indo-Pacific ecoregions (133)
  • 0.0% of Atlantic ecoregions (17)

Prepared by Uhiwai Wall

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What GAO Will Map

Greg Asner’s analysis from the Allen Coral Atlas shows the habitats across the region. The team will map all of the reef shown in red, plus an additional kilometer beyond it, to make sure nothing is missed.

Allen Coral Atlas map of Palau with reef extent shown in red.
Reef extent in Palau from the Allen Coral Atlas, shown in red. GAO will map all of the red plus an additional kilometer beyond it. Reef extent area: 1,341 km².
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