These hills on the Bohol Island of the Philippines consist of limestone, a sedimentary rock.
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Limestone layers started to dissolve and erode in time due to the effects of natural conditions. In the end, more than a thousand hills were formed, covering an area of kilometers.
While the hills are covered with vegetation in rainy seasons, they look green, while in the dry season they look brown in summer.
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These hills are called Chocolate Hills because their colors resemble chocolate.
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