Otanaha Fortress. In the past, the Kings of Gorontalo used Otanaha Fortress as a place of protection and defense. The unique of the Fortress applies in the material that was used to build the fortress, which was the mixed of sand, plaster and the white part of Maleo egg. The panorama of Danau Limboto also can be seen clearly from the fortress of Otanaha, because the fortress itself stands in the top of the highland. Precisely, the fortress is located in Dembe I, Kota Barat. The distance of the fortress is approximately 8 km from the center of Gorontalo city. Beside Otanaha fortress, there are two more fortress that also located in the same area, Otahiya and Ulupahu fortress. The visitor must pass 345 steps of stairs to reach the three of the fortress because of its position that located in the top of the highland. There is also alternative way to be able to reach the top of the mountain.