by building temples and sculptures of the Buddhist monuments in the state. It was ruled by the Mauryan Empire, Satavahana dynasty, Salankayanas, Andhra Ikshvakus, Pallavas, Vishnukundinas, Eastern Chalukyas, Rashtrakutas, Cholas, Kakatiyas, Vijayanagara Empire, Gajapati Empire, Mughal Empire, Deccan sultanates, Qutb Shahi dynasty, and Asaf Jahis. In the 3rd century BCE, Andhra was a vassal kingdom of Ashoka, but after his death Andhra became powerful and extended its empire to the whole of Maratha country and beyond. Andhra Pradesh comprises three major regions namely Rayalaseema in the south-west, Coastal Andhra bordering the Bay of Bengal in the east and Uttarandhra at north-east. The state has 26 districts, 6 in Uttarandhra, 12 in Coastal Andhra and 8 in Rayalaseema. The state also borders a union territory, Yanam – a district of Puducherry, which lies to the south of Kakinada in the Godavari delta on the eastern side of the state. The economy of Andhra Pradesh is the 8th largest in India, with a gross state domestic product (GSDP) of and has the country's 17th-highest GSDP per capita of . Andhra Pradesh ranks 27th among Indian states in Human Development Index (HDI). It has a jurisdiction over almost of territorial waters. Andhra Pradesh hosted 121.8 million visitors in 2015, a 30% growth in tourist arrivals over the previous year, making it the third most-visited state in India. The Tirumala Venkateswara Temple in Tirupati is one of the world's most visited religious sites, with 18.25 million visitors per year. The region is also home to a variety of other pilgrimage centres, such as the Pancharama Kshetras, Mallikarjuna Jyotirlinga and Kodanda Rama Temple. The state's natural attractions include the beaches of Visakhapatnam, hill stations such as the Araku Valley and Horsley Hills, and the deltas of Konaseema in the Godavari river, and Diviseema in the Krishna river. History Toponym A group of people named Andhras was mentioned in Sanskrit texts such as Aitareya Brahmana (800–500 BCE). According to Aitareya Brahmana of the Rig Veda, the Andhras left north India from banks of River Yamuna and settled in south India. The Satavahanas have been mentioned by the names Andhra, Andhrara-jateeya and Andhrabhrtya in the Puranic literature. They did not refer to themselves as Andhra in any of their coins or inscriptions; it is possible that they were termed as Andhras because of their ethnicity or because their territory included the Andhra region. Early and medieval history