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It was the site of Vijaya, one of the major city-states of Champa. Given its size, and the access to a major port as well as Bình Định's major river, it has long been the place where most of Bình Định's people and economic activities concentrate. It encompasses much of Quy Nhơn, the districts of Tuy Phước, An Nhơn, the western part of Phù Cát, and the eastern part of Tây Sơn. The largest lowland area is located in the south of the province along the lower Côn River. The districts of An Lão in the north-west, Vĩnh Thạnh in the west, and Vân Canh in the south-west are mostly mountainous. Most districts of Bình Định have a topography that is a mix of mountains or hills and lowlands. While most of the mountains as well as the highest peaks are in the west, there are mountains throughout the province, even near the coast. Elevations range from 0 at the coast to around 1200 meters above sea level in An Lão District in the north-west of the province. The majority of Bình Định province is covered by mountains or hills. The capital of Quy Nhon served as their capital until the Vietnamese Civil War of 1789–1802, when the province was wracked by warfare and the dynasty collapsed. The Tây Sơn dynasty originated from Binh Dinh, being named after Tây Sơn District where the rulers had come from. Major wars with Vietnam were fought in 1069 and again in the 15th century, which eventually led to the defeat of Vijaya and the demise of Champa in 1471. Around this time Vijaya seems to have been associated with, and at times even dominated by, the Khmer King Jayavarman VII. Major wars were fought with Angkor (now Cambodia) in the 12th and 13th centuries. Vijaya was involved in various wars with neighbouring countries. It also points to the relative abundance of labour in Vijaya compared to other Champa centres of power, because processing stones for construction was more labour-intensive than the production of bricks. This suggests some influence from Cambodian Angkor. Vijaya's architecture also distinguishes it from other Champa centers, since it used a combination of stone and brick elements, while most other Cham structures only used bricks. However, its architecture implies that it did not become important until the eleventh or twelfth century. Its centre was in the southern lowland of Bình Định. The city-state of Vijaya was located around this port and the main city, which was further inland. Its favourable geography led to the rise of the Cham Port of Thị Nại where Quy Nhơn is now located. Bình Định was probably one of the places where the Cham first arrived in what is now Vietnam.