Hikkaduwa National Park
One of three marine national parks in Sri Lanka.
Hikkaduwa National Park is one of Sri Lanka’s three marine national parks. Its protected status evolved over time: first designated a wildlife sanctuary in 1979, it became a nature reserve in 1988, and was finally upgraded to a national park in 2002. The park features a shallow fringing coral reef, averaging about 5 meters deep, which acts as a natural breakwater and helps curb coastal erosion.
The park lies in Sri Lanka’s wet zone, receiving around 2,000 millimeters of rain annually, mostly during the southwest and northeast monsoons (April–June and September–November). The inter-monsoon dry period is considered the best time to visit. Water temperatures range from 28°C to 30°C, while the mean annual air temperature is 27°C.
The coral reef is dominated by foliaceous Montipora species, alongside encrusting and branching varieties. Inshore areas feature massive colonies of Faviidae and Poritidae corals. Other types present include staghorn, elkhorn, cabbage, brain, table, and star corals. In total, 60 coral species from 31 genera have been recorded, along with over 170 species of reef fish from 76 genera. Seagrasses and marine algae from the genera Halimeda and Caulerpa are common at depths of 5–10 meters. These seagrasses support dugongs and sea turtles, and some prawn species feed on them. Eight species of ornamental fish also live on the reef, along with crabs, prawns, shrimps, oysters, and sea worms. *Porites desilveri* is a coral species endemic to Sri Lanka, and two reef fish—*Chlorurus rhakoura* and *Pomacentrus proteus*—are found only in Sri Lankan waters. Blacktip reef sharks patrol the outer slope. Three threatened sea turtle species visit the reef: the hawksbill, green, and olive ridley.
The reef has suffered significant degradation from both natural and human causes. A major coral bleaching event in 1998, linked to the El Niño phenomenon, reduced live coral cover from 47 percent to 13 percent. Experts suggest that at least 30–40 percent of the coral must be restored for the reef to sustain itself. Despite its protected status, the reef continues to face exploitation, including the removal of breeding ornamental fish and damage from tourism activities.
Quick Facts
- Iucn Category
- II
- Location
- Southern province, Sri Lanka
- Nearest City
- Hikkaduwa
- Area
- 101.6 ha
- Established
- 2002-09-19
- Governing Body
- Department of Wildlife Conservation
Facts from the source article.
Lore & Background
The area of Hikkaduwa National Park was declared a wildlife sanctuary on 18 May 1979, and then on 14 August 1988, upgraded to a nature reserve with extended land area. The growth of the number of visitors over the next 25 years increased the degradation of the coral reef. To reduce the effects to the ecosystem, the reef was declared a national park on 19 September 2002.
Reader's Guide
Hikkaduwa National Park is significant as one of Sri Lanka's three marine national parks, protecting a shallow fringing coral reef that reduces coastal erosion and forms a natural breakwater. The reef hosts 60 species of corals from 31 genera and over 170 species of reef fish, including endemic species such as Porites desilveri, Chlorurus rhakoura, and Pomacentrus proteus. It also provides habitat for threatened sea turtles like the hawksbill, green, and olive ridley. The park has faced threats from coral bleaching, particularly a 1998 event that reduced live coral cover from 47 percent to 13 percent, and from human activities such as removal of ornamental fish. The Boxing Day tsunami caused secondary impacts from terrestrial debris, but conservation groups and volunteers cleaned the reef. In 2023, the Wildlife Conservation Department began restoration efforts, and in 2025 a fine was imposed for coral damage, highlighting ongoing conservation challenges.
From Sanctuary to National Park: A Decades-Long Escalation of Protection
Hikkaduwa's journey toward full legal protection unfolded across more than two decades. The coastal waters first received formal recognition as a wildlife sanctuary on 18 May 1979, marking Sri Lanka's initial commitment to safeguarding this stretch of reef. Nearly a decade later, on 14 August 1988, the designation was elevated to a nature reserve, and the protected land area was expanded. However, the intervening years brought a surge in visitor numbers that steadily eroded the coral ecosystem. By the time the reef was finally declared a national park on 19 September 2002, the damage from two and a half decades of growing tourism pressure had become difficult to ignore. Today, Hikkaduwa stands as one of only three marine national parks in the country. Enforcement of that status remains active: in 2023 the Wildlife Conservation Department launched a coral-reef restoration programme, and in 2025 a man was arrested and fined after damaging living corals, with a court further ordering the immediate repair of the affected section of reef.
A Living Underwater Garden: Coral and Marine Life
The reef at Hikkaduwa is a classic shallow fringing formation, averaging roughly five metres in depth along a four-kilometre coastline. Foliaceous Montipora corals form the dominant growth form, supplemented by encrusting and branching varieties. In the shallower inshore zones, massive colonies of Faviidae and Poritidae corals anchor the substrate, while staghorn, elkhorn, cabbage, brain, table, and star corals add structural diversity. In total, sixty coral species across thirty-one genera have been documented. The fish community is equally rich: more than one hundred and seventy species spanning seventy-six genera call the reef home. Beneath the coral, seagrass beds and algae of the genera Halimeda and Caulerpa carpet the seabed at five to ten metres, providing forage for prawns and shelter for dugongs and sea turtles. Three threatened turtle species—hawksbill, green, and olive ridley—visit the reef, and blacktip reef sharks patrol the outer slope. Two fish species, Chlorurus rhakoura and Pomacentrus proteus, are found nowhere else on Earth, and the coral Porites desilveri is endemic to Sri Lanka.
Bleaching, Tsunami, and the Fight Against Exploitation
Hikkaduwa's reef has endured severe stress from both natural disasters and human activity. The most devastating single event was the 1998 El Niño-driven coral bleaching, which slashed live coral cover from forty-seven percent down to just thirteen percent. Conservationists estimate that at least thirty to forty percent of the reef must be restored before it can sustain itself ecologically. Even before that catastrophe, a quarter-century of rising visitor numbers had already degraded the ecosystem, prompting the 2002 national-park upgrade. Despite its protected status, the reef continues to face commercial pressure, including the removal of breeding ornamental fish destined for the aquarium trade. The 2004 Boxing Day tsunami, paradoxically, caused relatively little direct damage to Hikkaduwa and its sister park, Pigeon Island. The greater harm came from secondary effects: terrestrial debris washed onto the reefs, and two large fishing nets became tangled on the outer edge. A joint effort by conservation groups and volunteers was required to clear the wreckage and restore the seabed.
Climate, Coastline, and the Diver's Experience
Situated in Sri Lanka's wet zone, the park receives around two thousand millimetres of rainfall each year, delivered in two distinct monsoon windows: the southwestern season from April through June and the northeastern season from September through November. The dry inter-monsoon interval is widely regarded as the ideal window for visiting. Water temperatures hover between twenty-eight and thirty degrees Celsius, while the mean annual atmospheric temperature sits at twenty-seven degrees. The coastline stretches four kilometres and is characteristically narrow, varying between five and fifty metres in width depending on the year's climatic conditions. The fringing reef itself acts as a natural breakwater, buffering the shore against coastal erosion. Scuba diving is the most popular recreational activity in the park, drawing visitors to explore the shallow, species-rich reef. As one of Sri Lanka's three marine national parks, Hikkaduwa occupies a unique position where tropical climate, geological protection, and biological richness converge into a single, compact underwater landscape.
Frequently Asked Questions
What is Hikkaduwa National Park?
It is one of only three marine national parks in Sri Lanka, protecting a shallow fringing coral reef off the southern coast. The site has been under conservation protection since 1979, when it was first set aside as a wildlife sanctuary.
How did Hikkaduwa National Park earn its current protected status?
The area went through three stages of protection: it was declared a wildlife sanctuary on 18 May 1979, upgraded to a nature reserve on 14 August 1988, and finally granted national park status on 19 September 2002. This gradual escalation reflects growing recognition of the reef's ecological value.
What is special about Hikkaduwa National Park's coral reef?
The park's fringing reef is notably shallow, averaging around five metres in depth. This shallow structure serves a dual purpose: it shelters marine life while also acting as a natural breakwater that reduces coastal erosion along the shoreline.
What is the climate like around Hikkaduwa National Park?
The park sits within Sri Lanka's wet zone and receives roughly 2,000 millimetres of rainfall each year. Most of this rain falls during the southwest and northeast monsoon seasons, spanning April through June and September through November.
Why is Hikkaduwa National Park important to Sri Lanka?
As one of just three marine national parks in the country, it safeguards a critical stretch of coral reef ecosystem in the wet zone. Its shallow reef not only supports diverse marine biodiversity but also provides a natural coastal defence against erosion.
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