Funan Kingdom was formed from states (states in the mandala), whose first state was Na Phat Na (Nafuna / Naravaranagara) centered on the area of Oc Eo today. From Oc Eo, Na Phat Na expanded to form the sub-states, the "Conquering from the swamp" state, Cat Tien state and other states outside Vietnam territory today. At its most prosperous, King Pham Man (220-225) proclaimed himself "Funan Great King", invaded more than 10 countries, "expanding the land to six thousand miles" throughout Southeast Asia. Na Phat Na was once a central region in the mandala, a geographical region in the Hau River, including the Long Xuyen Quadrangle, U Minh, O Mon Phung Hiep and Soc Trang, Bac Lieu... So from the second half of the first century to the beginning of the third century, about 200 years, Na Phat Na (Oc Eo) was the first and the largest capital (450 hectares) of Funan kingdom.