This tourism object is located on the hill in Kelurahan Dembe I, West City District, Gorontalo City. The fort was built around the year 1522. The development history of this castle is as follows. Around the 15th century, people suspected that most of the land is sea water Gorontalo. At that time, the kingdom under the Government of Gorontalo King Ilato, or Matolodulakiki with Empress Tilangohula (1505-1585). They pick the three lineages, namely Ndoba (women), Tiliaya (women), and Naha (male). When a teenager, traveled to Naha across the country, while Ndoba and Tiliaya live in his kingdom. Once upon a time a Portuguese sailing ship stopped at Port of Gorontalo Since running out of food, the influence of bad weather, and pirates disorders. They faced the King Ilato. The meeting produced an agreement, that in order to strengthen domestic security and defense, will be constructed or erected three fortresses on the hills of District Dembe, West City District today, namely in the year 1525. Apparently, the Portuguese captain Ndoba only manipulate forces and expel Tiliaya when pirates would often interfere with the fishermen on the people and troops pantai.Seluruh and Ndoba reinforced Tiliaya four Apitalau, got up and urged the Portuguese to leave the land immediately Portuguese Gorontalo.Para nakhkoda leaving the Port of Gorontalo. Ndoba and Tiliaya appear as two fighters heroine straight time preparing people around to fend off enemy attacks and the possibility of a war that will terjadi.Pasukan Ndoba and Tiliaya, reinforced by the navy, led by the Apitalau or 'sea captain', ie Apitalau Lakoro , Pitalau Lagona, Apitalau Lakadjo, and Apitalau Djailani. Around the year 1585, Naha third rediscover the fortress. He was to marry a woman named Ohihiya.Dari this couple was born two sons, namely Thighs (PAHU) and Limonu.Pada time there is a war against the group leaders Hemuto or transmigration through the northern route. Naha and Thigh fall against Hemuto. Limonu avenge the death of his father and brother. Naha, Ohihiya, thighs, and a third had used Limonu fortress as the center of the defense forces. With background events above, it is the third castle was immortalized by the following names. First, Otanaha. Ota means fortress. Naha is the person who found the fortress. Otanaha means fortress found by Naha. Second, Otahiya. Ota means fortress. Hiya Ohihiya acronym of the word, the wife Otahiya Naha, meaning the fort Ohihiya property. Ulupahu.Ulu third Uwole acronym of the word, means property of PAHU is the son of the fort's Naha.Ulupahu means PAHU Son Naha. Fortress Otanaha, Otahiya, and Ulupahu built around the initiative of King tahun1522 and the skipper Ilato Portugal. Otanaha fort situated on a hill, and has 4 fruit haven and 348 pieces to the top of the stairs to the castle site. Number of steps is not the same for every stopover. From the bottom to the haven I have 52 steps; II = 83; III = 53; IV = 89; Fort = 71 steps (total: 348 steps up).