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The Science behind Chocolate Hills in Bohol


The Chocolate Hills in Bohol is one geologic phenomena most people know little of. Here’s one of the more accepted scientific explanation about it as printed in a bronze plaque at the top of the Chocolate Hills Complex View Deck.

About 2 million years ago, most of the island of Bohol was below a shallow sea coral reefs, similar to those now found offshore of Northern Bohol, thrived and extensibly covered the sea floor. During stormy days, fragments of coral and shells derived by waves from the reefs were deposited were mostly deposited in the landward side of the reefs. The coral and shell fragments formed relatively thin layers surrounding the live coral reefs.

chocolate hills

Slowly, the land rose causing the coral reef formation to emerge out of the sea. The taller arrows shown in the diagram indicate that the southern sections of Bohol island have been uplifted more than the northern section.

The Chocolate Hills have been carved out from the relatively thin layers of coral and shell fragments. Gullies were developed in the low lying areas and lakes occupied pre-existing depressions.

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  • Hi,

    I’m a newbie in blogging yet I find it. I am from the same place and live in the Tagbilaran City.

    I have a small tour services in the City. If you guys wanna check http://www.bohol-travel.com

    We hope to see you guys there!

  • The Hills now does not look like chocolate now becuase of the rainy season. It looks chocolate during the peak of summer. Amazzing…, its a wonder of nature.

  • gracym _ark

    ganda talaga jan, sure jud!

  • Visited the chocolate hills just this month. Great view. Clean place. Makes you wonder in amazement about the beauty of nature.

  • ito ang next kong pupuntahan pag-uwi ko

  • Wow i love that picture. If i would get a chance to visit a place i’d go for Bohol great place.

  • Wow..very informative..I really loved to see this place…

  • That’s quite interesting. Its nice to learn more about Bohol and how the Chocolate Hills was formed. Thanks for this!

  • Featured Bohol in one of my blog post and the place is really exciting. I wish I could be there this year.

  • Hi, courteous posts there :-) through’s concerning the interesting information

  • Wow! a great place to be also. Thanks for sharing this chocolate hills in bohol. I wanted to visit this one also if ever I had a chance. Thanks for great writing.

  • louvy

    I’ve never been there in Bohol ever since, but when I read your article about it, I was amazed and I would definitely want to visit it.

  • when we went there it was raining so I didn’t see the same scene as the picture. never thought it was that beautiful.

  • Chocolate Hills in Bohol seems very amazing…i hope i will be there somedays later

  • The Chocolate Hills is one of the best tourist spot in the Philippines. Because of its unexplainable formation of this Hills and their color that make them look like chocolates. It’s a great place to visit on…thanks.

  • Wow by the sound of it I would definitely want to visit it..

  • Thanks very much for the info, i always wondered how the Chocolate Hills where formed.

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  • that is good to know. the place is just awesome.