The Chocolate Hills is an unusual geological formation in Bohol, Philippines. It is composed of around 1,268 perfectly cone-shaped hills of about the same size, spread over an area of more than 50 square kilometres (20 sq mi). They are covered in green grass that turns brown during the dry season, hence the name.
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The Chocolate Hills is a famous tourist attraction of Bohol. It is featured in the provincial flag and seal to symbolize the abundance of natural attraction in the province. It is in the Philippine Tourism Authority’s list of tourist destinations in the Philippines; it has been declared the country’s 3rd National Geological Monument and proposed for inclusion in the UNESCO World Heritage List.
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The Chocolate Hills is a rolling terrain of haycock hills – mounds of general shape which are conical and almost symmetrical. Estimated to be at least 1,268 individual mounds to about 1,776, these cone-shaped or dome-shaped hills are actually made of grass-covered limestone. The domes vary in sizes from 30 to 50 metres (98 to 160 ft) high with the largest being 120 metres (390 ft) in height. They are scattered throughout the towns of Carmen, Batuan and Sagbayan in Bohol. Bohol’s “main attraction”, these unique mound-shaped hills are scattered by the thousands on the island’s central plain, concentrated near the town of Carmen.
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There are a number of hypotheses regarding the formation of the hills. These include simple limestone weathering, sub-oceanic volcanism, the uplift of the seafloor and a more recent theory which maintains that as an ancient active volcano self-destructed, it spewed huge blocks of stone which were then covered with limestone and later thrust forth from the ocean bed.
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Another way the origin is stated is that they were formed centuries ago by tidal movement and by the uplift of coral deposits and the action of rain water and erosion. Another theory is that they were ancient coral limestone reefs shaped by many thousands of years erosion by both water and wind. Geologists think that the specific shape of the hills is caused by the influence of the weather over millions of years. The break down of the upper layers of the limestone formations, followed by the erosion processes, resulted in these cone-shaped remnants. It is likely that they were once limestone deposits beneath the sea, uplifted by the movement of plates and then smoothed by wind and rainwater erosion.
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