My Hubby on top of one of the hills back in 2010
There are over 1,270 similarly cone-shaped hills creating a sea of hills over 20 square miles (50 sq km) - scattered throughout the towns of Carmen, Batuan and Sagbayan in Bohol. Heights typically range from 98 to 160 feet (30 to 50 m) with the highest reaching 390 feet (120 m).
The Chocolate Hills was declared Philippines’s 3rd National Geological Monument (together with Taal Volcano, and Hundred Islands National Park) and included in the nomination for the New 7 Wonders of Nature, and also proposed for inclusion in the UNESCO World Heritage List.
214 steps to the top of the observation hill near the complex
I have been calling this world-renowned attraction mysterious because up to this day, even geologists have not reached consensus on how they were formed. There are 4 different old-folks stories/legends, but of course the most commonly accepted is the theory from the professionals. It's believed though not proven yet, that these Chocolate Hills are the weathered formations of a kind of marine limestone on top of an impermeable layer of clay. If you climb the 214 steps to the top of the observation hill near the complex, you can read this explanation on a bronze plaque.
Note: Last October 15, 2013, at 8:12 AM, Bohol was jolted by a 7.2-magnitude earthquake leaving some parts of the hills dented.