Part of the regional summaries: Saudi Arabia - Jeddah / KAUST (Thuwal) / Rabigh, Saudi Arabia, and Red Sea

Coral Gardens lives up to its name — a reef built on giant, several-meters-wide massive Porites mounds and tall pinnacles rising almost to the surface, layered with staghorn and corymbose Acropora and rose-colored pocilloporids. Across two August 2024 visits a week apart, cover held steady at 27-29% while the bleached fraction of coral tissue climbed from 41% to 45% as accumulated heat stress rose, with the reef's largest defining corals — the giant Porites mounds — showing near-universal paling.
حدائق المرجان اسم على مسمى - شعاب مبنية على تلال عملاقة من Porites الكتلية بعرض عدة أمتار وقمم شاهقة ترتفع حتى قرب السطح، تكسوها طبقات من Acropora قرون الأيل والعنقودية وبوسيلوبوريات وردية اللون. وعبر زيارتين في أغسطس 2024 تفصل بينهما أسبوع، ثبتت التغطية عند 27-29% بينما ارتفعت النسبة المبيضّة من نسيج المرجان من 41% إلى 45% مع تزايد الإجهاد الحراري المتراكم، وأظهرت أكبر مرجانيات الشعاب وأكثرها تمييزًا لها - تلال Porites العملاقة - شحوبًا شبه شامل.
ترجمة هذا الملخص بالذكاء الاصطناعي؛ النص الإنجليزي هو المعتمد.
One other CRD dive site with its own page within 5 km shown in orange — click a marker to open its page.
10 of the 23 photographs on this page are shown beside the text that discusses them under "Site description" below.
The reef is built on giants. Its defining structures are enormous knobby and columnar Porites mounds — one frame is filled edge to edge by a single colony several meters across and several meters tall, standing free on sand with anthias streaming past — and tall pinnacles that rise almost to the surface, their flanks holding clouds of small fish (e.g., Image 5, Image 6).
Between and over them sit corymbose and staghorn Acropora in tan and gold, dusty-rose and salmon pocilloporids, green foliose plates, small domed massives, and encrusting plates (e.g., Image 1, Image 8, Image 9); giant clams (e.g., Image 21, Image 22) and a blue-spotted ribbontail ray (Image 23) sit in the pavement.
Nearly all of the big Porites mounds are pale (e.g., Image 7), and one large massive colony carries old partial mortality: its upper surface is gray, turf-covered dead skeleton above a basal band of living brown tissue (e.g., Image 3).
Anderson's field notes for these dives, which record paling Porites, mild bleaching, struggling corals, and a bleached Pocillopora verrucosa, describe exactly what the frames show.
Apart from our own published survey shown here, we found no other surveys at this site as of 2026. If you would like to share yours, please email us.
Two dives a week apart in August 2024 with Al-Haddad SCUBA, on a Jeddah reef that lives up to its name.
Coral Gardens: surveyed twice in August 2024 (10 and 17 August) (CoralNet point counts; Mayfield 2025, Environments 12:248). Surveyed in partnership with Al-Haddad SCUBA.
| Method | Hard coral cover (%) | Photos (n) ± SE |
|---|---|---|
| Published point count (CoralNet-assisted) | 27.6 | |
| In-house DINOv3 | 44.5 | n = 156 |
| CoralSCOP edited | 29.2 | n = 254 |
| Claude (edited photos) | 25.5 | n = 271 · SE 1.0 |
The three computer-vision methods disagree by 19.0 pp (25.5–44.5%) and read on both sides of the published point count (27.6%); the headline is the published point count because it is the site's published value (CoralNet-assisted: most frames were annotated by CoralNet's AI, trained and checked by the author).
See a more detailed, stand-alone version of this table.
Coral bleached: computer-vision (CoralNet) estimate from the survey images, per dive, as published in Mayfield (2025, Environments 12:248), Supplementary File S1.
| Date | Time in | Max depth (m) | Bottom time (min) | Coral bleached (%) |
|---|---|---|---|---|
| 2024-08-10 | — | — | — | 41.4 |
| 2024-08-17 | — | — | — | 45.4 |
All images from Coral Reef Diagnostics. Data are from Coral Reef Diagnostics.
© Coral Reef Diagnostics.