Pigeon Island — Trincomalee

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Hotels, dive operators, gear, and how to get here are on the Trincomalee location page.

Overview

Shallow fringing-reef marine park 1 km off Nilaveli on Sri Lanka's east coast, named for the rock pigeons nesting on its two granite outcrops. Reef structure sits in 3-15 m and carries over 100 hard and soft coral species — Acropora and Montipora tables alongside Sinularia leather corals — and roughly 300 reef fish including Moorish idols, parrotfish, butterflyfish, lionfish, moray eels, and Kuhl's stingrays. Blacktip reef sharks aggregate predictably in the shallow sand patches north of the main island during the calm May-September season; hawksbill and green turtles graze the coral heads year-round, and octopus, nudibranchs, and pipefish work the cracks. The 2004 tsunami and recent bleaching events have left scars, but coral cover here remains the healthiest along Sri Lanka's east coast.

Briefing note

Pigeon Island National Park requires an entry permit purchased onshore at Nilaveli (Department of Wildlife Conservation); dive operators usually arrange tickets. The park is closed during the November-March northeast monsoon when seas are rough and visibility collapses. Blacktip reef sharks here are best observed while snorkeling the shallow sand pools on the north side; on scuba you'll see fewer sharks but more coral structure on the back reef. Anchor damage and crowding from snorkel tourism have stressed the reef — do not stand on coral, touch wildlife, or feed fish.

What you'll see

10 species curated

Blacktip reef shark
seasonal
Peak: May · Jun · Jul · Aug · Sep · Oct
Hawksbill turtle
year-round
Green turtle
year-round
Kuhl's stingray
year-round
Moorish idol
year-round
Lionfish
year-round
Giant moray
year-round
Reef octopus
year-round
Parrotfish
year-round
Butterflyfish
year-round

Sightings evidence

1 record on file

Blacktip reef shark
medium confidence
Last confirmed
May 2026
Recent records
45 within 10 km
Cluster months
May, Jun, Jul, Aug, Sep, Oct

Sources & methodology

How we summarise this

We aggregate confirmed occurrence records from GBIF and OBIS within a fixed radius of each dive site. Occurrence records confirm presence and reveal seasonality clustering, but they DO NOT measure per-dive probability — there is no eligible-effort denominator. We deliberately do not publish a numeric '% chance of sighting' from this data.

Sources

Global Biodiversity Information Facility — GBIF Secretariat
Ocean Biodiversity Information System — IOC-UNESCO
iNaturalist — California Academy of Sciences & National Geographic Society
IUCN Red List of Threatened Species — International Union for Conservation of Nature
Wildbook (Sharkbook, Whale Shark, Manta Matcher) — Wild Me
OBIS-SEAMAP — Duke University Marine Geospatial Ecology Lab / OBIS
WoRMS — World Register of Marine Species — Flanders Marine Institute (VLIZ)
FishBase — FishBase Consortium
Atlas of Living Australia — CSIRO / GBIF Australia
REEF Volunteer Fish Survey — Reef Environmental Education Foundation

Conditions

Month	Water	Visibility	Current
Jan	26–28 °C	5–10 m	strong
Feb	26–28 °C	5–15 m	moderate
Mar	27–29 °C	10–20 m	mild
Apr	28–30 °C	15–25 m	mild
May	28–30 °C	15–25 m	mild
Jun	28–30 °C	15–25 m	mild
Jul	28–30 °C	20–30 m	mild
Aug	28–30 °C	20–30 m	mild
Sep	27–29 °C	15–25 m	mild
Oct	27–29 °C	10–20 m	moderate
Nov	26–28 °C	5–10 m	strong
Dec	26–28 °C	5–10 m	strong

Season calendar

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Peak season highlighted · current month outlined

Gear for this site

Beyond the basic kit

Reef-safe sunscreen — The park has restricted-use rules around chemical sunscreens; reef-safe formulas are expected and most operators check at briefing.
SMB — Boat traffic between Nilaveli and the park is constant during season; surface the dive on a deployed SMB for pickup.

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