Chocolate Hills and the cone karst landscape of Bohol
Published on 09/21/2026 at 20:32 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Chocolate Hills in Bohol, Philippines, form one of Southeast Asia’s most distinctive limestone landscapes, a wide field of grass?covered cones shaped over millions of years in marine rock. Set in the central part of Bohol Island, the hills are recognised nationally as a geological monument and highlighted within the Bohol Island UNESCO Global Geopark for their cone karst terrain and shallow?sea origins.
A field of limestone cones in central Bohol
The Chocolate Hills stretch across the interior of Bohol as a dense collection of conical hills rising from relatively flat plains, with the landscape reaching elevations between about 100 m and 500 m (328 ft and 1,640 ft) above sea level.Chocolate Hills Natural Monument In this central belt of the island, smooth limestone mounds sit close together, separated by low fields and patches of woodland that emphasise their regular spacing.
Geologists describe the Chocolate Hills as a cone karst or kegelkarst landscape, made up of conical hills carved into marine limestone that was once part of a coral reef platform in the Pliocene and Early Pleistocene.Bohol Island Geopark description The underlying rock is a sandy to rubbly marine limestone containing fossils of foraminifera, corals, molluscs and algae that accumulated in a shallow sea roughly two million years ago.marine limestone with fossils
How the cone karst landscape formed
The present pattern of hills developed after the limestone platform was raised above sea level by tectonic movements and fractured, exposing the rock to tropical rain, streams and groundwater that gradually dissolved the carbonate and cut into its surface.karstification of uplifted reef limestone Over geological time, this process produced a tropical karst landscape of mogotes: steep?sided, almost symmetrical hills separated by lower?lying plains with caves and springs close to their bases.tropical mogotes in karst terrain
Individual Chocolate Hills typically rise tens of metres above the surrounding land, with many cones in the central zone described in geopark documentation as lying between about 30 m and 400 m (98 ft and 1,312 ft) high.UNESCO Global Geopark profile Their surfaces are covered by grasses rather than dense forest, giving each hill a smooth outline that stands in contrast to the more irregular limestone ridges and cliffs found in other karst regions.
Colour, texture and protected status
The name “Chocolate Hills” refers to the colour change of the grass on the limestone cones: in wetter periods the hills appear green, while in drier months the grass turns brown and gives the mounds a chocolate?coloured appearance against the lighter sky.grass?covered limestone cones The cones themselves are built from carbonate rock composed mainly of calcite and aragonite, typical of limestone derived from coral and shell fragments, and their weathered surfaces support only shallow soils and hardy grasses.
Within the Philippines the Chocolate Hills have been declared a National Geological Monument, recognising the karst field in Bohol Province as an outstanding example of conical karst in tropical marine limestone and proposing it for inclusion on the UNESCO World Heritage List.National Geological Monument status The same cone karst landscape features prominently in the Bohol Island UNESCO Global Geopark, where it represents a key site for understanding the island’s evolution from a submerged coral platform into its present raised and dissected terrain.cone karst landscape of conical hills
Visiting Chocolate Hills: what travellers from Western Europe should know
- Chocolate Hills lie in the central part of Bohol Island in the Visayas region of the Philippines, inland from the island’s coastal towns and reached by road from Tagbilaran City and other Bohol settlements.
- Viewpoints and approach roads sit among the limestone cones and plains, with short climbs and staircases on compacted paths leading from parking areas up to platforms overlooking the grass?covered hills.
- The terrain around the Chocolate Hills combines low agricultural land with uneven karst ground, so walks away from formal viewpoints can involve rough surfaces, patches of exposed rock and changes in gradient.
- The official language is Filipino and the currency is the Philippine peso.
- Entry requirements depend on your nationality; UK travellers can check the FCDO travel advice at gov.uk/foreign-travel-advice, Irish travellers the Department of Foreign Affairs at ireland.ie.
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Frequently asked questions about Chocolate Hills
Where are the Chocolate Hills?
The Chocolate Hills are in Bohol Province in the central Visayas region of the Philippines, forming a cone karst field in the island’s interior.
What should visitors expect on a visit?
Visitors encounter a landscape of grass?covered limestone hills rising from plains, viewed from roadside platforms and short climbs that offer broad panoramas over the karst terrain.
What makes the Chocolate Hills distinctive?
The Chocolate Hills are distinguished by their regular pattern of conical marine limestone hills formed from an uplifted reef platform, recognised as a National Geological Monument within the Philippines.
