Tamil Nadu (; Tamil: [ˈtamiɻ ˈnaːɽɯ] (listen), abbr. TN) is a state in southern India. It is the tenth largest Indian state by area and the sixth largest by population. Its capital and largest city is Chennai. Tamil Nadu is the home of the Tamil people, whose Tamil language—one of the longest surviving classical languages in the world—is widely spoken in the state and serves as its official language. The state lies in the southernmost part of the Indian peninsula, and is bordered by the Indian union territory of Puducherry and the states of Kerala, Karnataka, and Andhra Pradesh, as well as an international maritime border with Sri Lanka. It is bounded by the Western Ghats in the west, the Eastern Ghats in the north, the Bay of Bengal in the east, the Gulf of Mannar and Palk Strait to the south-east, and the Indian Ocean in the south. The at-large Tamilakam region that has been inhabited by Tamils was under several regimes, such as the Sangam era rulers of the Chera, Chola, and Pandya clans, the Pallava dynasty, and the later Vijayanagara Empire, all of which shaped the state's cuisine, culture, and architecture. After the fall of the Kingdom of Mysore, the British colonised the region and administered it as part of the Madras Presidency, headquartered at the city of Madras, now known as Chennai. After India's Independence in 1947, the Madras State came into existence, whose borders were linguistically redrawn by the States Reorganisation Act, 1956, losing territory to Kerala, Karnataka and Andhra Pradesh. The state was renamed as Tamil Nadu in 1969. It is home to a number of historic buildings, multi-religious pilgrimage sites, hill stations and three World Heritage Sites.The economy of Tamil Nadu is the second-largest in India, with a gross state domestic product (GSDP) of ₹24.85 lakh crore (US$310 billion) and has the country's 11th-highest GSDP per capita of ₹225,106 (US$2,800). It ranks 11th among all Indian states in human development index. Tamil Nadu is the most urbanised state in India, and one of the most industrialised states; the manufacturing sector accounts for more than one-third of the state's GDP. Its tourism industry is the largest among the Indian states. The Tamil film industry plays an influential role in the state's popular culture.

Visakhapatnam (, formerly known as Vizagapatam), also known as Vizag, Viśākha or Waltair, is the largest and most populous city in the Indian state of Andhra Pradesh. It is between the Eastern Ghats and the coast of the Bay of Bengal. It is the second-largest city on the east coast of India after Chennai, and the fourth-largest in South India. It is one of the four smart cities of Andhra Pradesh selected under the Smart Cities Mission and serves as the headquarters of Visakhapatnam district. With an estimated output of $43.5 billion, it is the ninth-largest contributor to India's gross domestic product as of 2016.Visakhapatnam's history began in the 6th century BCE, when it was considered part of the Kalinga Kingdom, and later ruled by the Vengi, the Pallava and Eastern Ganga dynasties. Visakhapatnam was an ancient Port city which had trade relations with the Middle East and Rome. Ships were anchored at open roads and were loaded with cargo transported from Visakhapatnam shore by means of small Masula boats. A reference to Vizagapatam merchant is available in the inscriptions of Sri Bheemeswara Swamy temple (1068 AD), East Godavari District, Andhra Pradesh. During 12th century AD, Vizagapatam was a fortified merchandize town managed by a guild. The city's control was alternating between the Chola dynasty and the Gajapati Kingdom in 11th and 12th centuries, until its conquest by the Vijayanagara Empire in the 15th century.In the 16th century, after the decline of the Vijayanagara empire and the Gajapatis, the coastal region of North Andhra, including Visakhapatnam, was annexed by the Jeypore Kingdom and remained part of it until the arrival of the British in 1711. Evidently, the Maharaja of Jeypore was commonly referred to as the Maharaja of Visakhapatnam until the dissolution of the princely state in 1947. European powers eventually established trade operations in the city, and by the end of the 18th century it had come under French colonial rule. Control passed to the East India Company in 1804 and it remained under British colonial rule until Indian independence in 1947. The city is home to some reputed Central and State educational institutions of the state, including Andhra University (AU), Andhra Medical College (AMC), Indian Institute of Management (IIM), Indian Institute of Petroleum and Energy (IIPE), Damodaram Sanjivayya National Law University (DSNLU), Indian Maritime University (IMU), and the National Institute of Oceanography among others. Visakhapatnam serves as the headquarters for the Indian Navy's Eastern Naval Command. The city also serves as the zonal headquarters of South Coast Railway Zone (SCoR). The city is also home to the oldest shipyard and the only natural harbour on the east coast of India. Visakhapatnam Port is the fifth-busiest cargo port in India. The city is a major tourist destination and is known for its beaches, ancient Buddhist sites, and the natural environment of the surrounding Eastern Ghats. It is nicknamed as the "City of Destiny" and the "Jewel of the East Coast". According to the Swachh Survekshan rankings of 2020, it is the ninth cleanest city in India among cities with a population of more than 1 million. In 2020, it was a finalist in the Living and Inclusion category of the World Smart City Awards.