Coral Reef Diagnostics

Egypt Red Sea - Habili Gazella (Wadi Lahami)

Reef Check Foundation
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05
Coral Reef Diagnostics
Photo: Anderson Mayfield/Coral Reef Diagnostics
Country
Survey date(s)
2024-09-23
Coordinates
24.1857, 35.4380
This site is in the vicinity of a land-based point.
Coral cover
18%
Manual point count (181 photos) · other methods below
Observations
Heat stress
Today’s heat load
16 Sep 2026 · Alert Level 2
5-year thermal stress load
5-year mean max. degree heating weeks (DHW)
2021–2025
NOAA Coral Reef Watch — Egypt 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 infoEgypt (NOAA CRW virtual station) · Northern and Central Red Sea ecoregion mean=12.2°C-heating weeks
Photographs
50
Site summary
Read this summary in:

A submerged pinnacle near Gazella Reef whose shallow crest carries a dense, colorful framework of branching corals, fire coral, and brain domes, with streams of red and orange anthias and a pair of patrolling trevally. About 46% of coral tissue was bleached in September 2024, among the lower figures of the Egypt leg, and the marker position is offset about 200 m from its source coordinates.

Water temp. during survey
31.0°C
+3.6°C vs the 2024 mean sea temperature (27.4°C)

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

Four other CRD dive sites within 5 km shown in orange — click a marker to open its page.

4 of these 50 photographs are shown beside the text that discusses them under "Site description" below.

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Photo credit & attribution

Site description

General benthic features

The pinnacle rises into a shallow crest carrying a dense, structurally rich framework — corymbose Acropora and cauliflower pocilloporids in cream, gold, pink, and lavender, mustard Millepora-type fire coral, olive faviid domes, tabulate plates, and encrusting growth packed close, with anthias in red and orange streams over it and a pair of trevally patrolling above (e.g., Image 1, Image 2, Image 3).

Coral cover

Coral cover is 17.7% ± 13.2 across 181 photographs, quoted verbatim from Mayfield, A.B. (2025) Environments 12:248 — Red Sea 2023-24 bleaching; CoralNet point annotation, Appendix A — a manual, diver-annotated CoralNet point count from Anderson's own published work, not a computer vision output and not recomputed here. The site record's prose gives the visit as 18% cover with 45.9% of coral tissue bleached at about 21.8°C-weeks DHW; the numeric fields carry 17.7% and 45.5%.

Stressors

That is the second-lowest bleaching figure of the Egypt leg, behind Habili Gazella's own near neighbor Gazella Reef, and it is visibly lower in the photographs too.

Comparisons with other data

No independent survey was made at this exact site; the nearest ones are listed in the table below.

Dive record

The third dive of 23 September 2024 with Red Sea Diving Safari, on the habili — the submerged pinnacle — associated with Gazella Reef (e.g., Image 4).

Other notes

A coordinate caveat travels with this site, recorded in the site record itself: the source sheet gave Habili Gazella the same coordinates as Gazella Reef, and an offset of roughly 200 m south has been applied so both markers are visible. The position should be corrected if better coordinates emerge. See flags.

CV model comparison

Computer vision on this site's own photographs gives In-house DINOv3 point classifier 41% — reported alongside rather than merged, because as of September 2026 no computer-vision method estimates coral cover accurately on new images.
Headline is the reference value; every other row is listed beside it for comparison and none is averaged in.
More infoThe reference row is this dive site's own published value (Mayfield 2025, Appendix A, 181 photos); the other rows are AREA-level (Wadi Lahami) comparisons, not run on this site's frames. ⚠ The comparison rows are REGIONS, not dive sites: the paper's main tables report cover by region, and this site's own value comes from its Appendix A. ⚠ The manual column and the CV columns are on DIFFERENT FRAME SETS: the published cover spans 674–1,180 frames, the CV arms ran on the 30- and 129-frame hand-scored reference subsets. CoralNet is n/a by design: the reference set IS the hand-scored set. DINOv3 is restricted to frames it never saw. CoralNet automated point classifier: n/a — the reference set IS the hand-scored set; these frames carry no independent CoralNet robot label to compare against CoralSCOP (SAM-based mask-sum), unedited photos: pending — CoralSCOP run: 370/747 images scored at build time CoralSCOP (SAM-based mask-sum), edited photos: pending — CoralSCOP run: 370/747 images scored at build time
MethodHard-coral cover (%)
Manual (published)17.7
In-house DINOv340.6
Claude28.0

Independent surveys nearby

Hard coral cover over time — this site and 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%15%30%45%60%200920162024Reef Check 2009: 30%Reef Check 2009: 56%Reef Check 2012: 30%Reef Check 2012: 45%Reef Check 2018: 46%Reef Check 2018: 52%Reef Check 2023: 41%Reef Check 2023: 44%Dr. Coral (CRD) 2024: 18%Year-averaged across all programs: no detectable trend (-0.79 pp per year, not separable from zero; 5 years)
Reef Check Dr. Coral (CRD)Year-average (no detectable trend)

Within 5 km, 2 independent survey stations recorded hard coral cover in 16 surveys between 2009 and 2023. Of the 2 stations surveyed in more than one year, 1 declined and 1 increased between their first and latest surveys. The longest record, Wadi Lahami House Reef 1 (Reef Check, 3.41 km away), went from 30% in 2009 to 41% in 2023. Surveys since 2021 average 43% (range 41–44%, n=2). This site's own estimate (18%) sits 23.5 points below the recent range (41–44%); the methods differ, so the comparison is context, not a like-for-like test.

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 range is shown. Station names are not dive-site names.

Independent survey data near this site
AgencySite / locationDateHard coral cover (%)DistanceLink
Reef CheckWadi Lahami House Reef 12009–202330–46% (8 surveys)3.41 km—
Reef CheckWadi Lahami House Reef 22009–202344–56% (8 surveys)3.44 km—

Data & links

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

© Coral Reef Diagnostics.