Coral Reef Diagnostics

Philippines - Coron: Green Lagoon (island-hopping snorkel)

Reef Check Foundation
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05
Photo: Anderson Mayfield/Coral Reef Diagnostics
Survey date(s)
2017-01-28
Coordinates
11.9439, 120.2042
Coral cover
not reported
Too few images to estimate coral cover.
Observations
None tagged; see Stressors below
Heat stress
Most recent heat load record
26 Oct 2026 · Bleaching Warning
5-year thermal stress load
5-year mean max. degree heating weeks (DHW)
2021–2025
NOAA Coral Reef Watch — Western Philippines virtual station
i 5-year mean max. DHW is the mean of the annual maximum DHWs over the five complete years named above, not conditions today.
More infoWestern Philippines (NOAA CRW virtual station)
Photographs
5
2 shown on this page
Site summary
Read this summary in:

Green Lagoon, one of the karst lagoons on Coron Island's south coast, was a snorkel stop on a 2017 island-hopping day, with boulder and branching corals in the shallows. The record is based on just a handful of photos.

Sea surface temp. (satellite)
28.4°C
satellite sea surface temperature (SST) on the survey date (NOAA Coral Reef Watch, Western Philippines), not an in-water reading; it is the warmest-pixel (90th percentile) reading in the station area and can run 1–1.5°C above the reef

Two independent survey stations shown with the program’s logo — click one to see how far it is from this site.

One other CRD dive site with its own page within 5 km shown in orange — click a marker to open its page.

Site description

Setting

Green Lagoon, Coron Island, Palawan — a snorkel stop on the island-hopping day of 28 January 2017, in the karst lagoons on Coron's south coast.

Coral cover

Stressors

No bleaching, disease, crown-of-thorns starfish, or other stressor is recorded for this snorkel stop (28 January 2017): Anderson's Palawan trip notes list Green Lagoon only as a stop on the Coron island-hopping day, and the dive log has no entry for it.

Comparisons with other data

We found no other surveys at this site as of 2026. Within 5 km, two Reef Check stations recorded station-year means of 28–73% hard coral cover between 2013 and 2015; the nearest, Reef Check at CYC East Reef, 3.30 km away, read 34–73% between 2013 and 2015.

Other notes

Position is from the photographs' own GPS (4 frames), not an estimate.

Independent surveys nearby

Hard coral cover over time — every independent station within 5 km. Programs are shown separately because they use different methods at different stations; the lines are not one comparable series.
0%20%40%60%80%20132015Reef Check 2013: 66%Reef Check 2013: 73%Reef Check 2014: 30%Reef Check 2014: 50%Reef Check 2015: 28%Reef Check 2015: 34%Year-averaged across all programs: no detectable trend (-19.22 pp per year, not separable from zero; 3 years)
Reef CheckYear-average (no detectable trend)

Within 5 km, 2 independent survey stations recorded hard coral cover in 6 surveys between 2013 and 2015. Of the 2 stations surveyed in more than one year, 2 declined (by 38–39 points) between their first and latest surveys. Two stations share the longest span (2013–2015); one, CYC East Reef (Reef Check, 3.30 km away), went from 73% (best patch) in 2013 to 34% in 2015. The most recent nearby survey is from 2015, so these values predate recent heat stress.

Collected by other programs using different methods (Reef Check uses point-intercept transects), so these are context for the figures above, not a like-for-like comparison. Where a station was surveyed more than once, the cell shows either the range of its values or, as a single value, the mean of surveys made in one year. Station names are not dive-site names. Values above 70% are marked “best patch”: surveys often target the densest coral on a reef, so these may overstate the site as a whole.

Independent survey data near this site
AgencySite / locationDateHard coral cover (%)Distance
Reef CheckCYC East Reef2013–201534–73% (3 surveys) best patch3.30 km
Reef CheckCYC West Reef2013–201528–66% (3 surveys)3.59 km

Data & links

All images from Coral Reef Diagnostics. Data are from Coral Reef Diagnostics and the organizations named in the data sources above.

© Coral Reef Diagnostics.