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.

Surat is a city in the western Indian state of Gujarat. Located on the banks of the river Tapti near its confluence with the Arabian Sea, it used to be a large seaport. It is now the commercial and economic center in South Gujarat, and one of the largest urban areas of western India. It has well-established diamond and textile industry, and is a major supply centre for apparels and accessories. About 90% of the world's diamonds supply are cut and polished in the city. It is the second largest city in Gujarat after Ahmedabad and the eighth largest city by population and ninth largest urban agglomeration in India. It is the administrative capital of the Surat district. The city is located 284 kilometres (176 mi) south of the state capital, Gandhinagar; 265 kilometres (165 mi) south of Ahmedabad; and 289 kilometres (180 mi) north of Mumbai. The city centre is located on the Tapti River, close to Arabian Sea.Surat will be the world's fastest growing city from 2019 to 2035, according to a study conducted by Economic Times. The city registered an annualised GDP growth rate of 11.5% over the seven fiscal years between 2001 and 2008. Surat was awarded "best city" by the Annual Survey of India's City-Systems (ASICS) in 2013. Surat is selected as the first smart IT city in India which is being constituted by the Microsoft CityNext Initiative tied up with IT services majors Tata Consultancy Services and Wipro. The city has 2.97 million internet users, about 65% of total population. Surat was selected in 2015 for an IBM Smarter Cities Challenge grant. Surat has been selected as one of twenty Indian cities to be developed as a smart city under PM Narendra Modi's flagship Smart Cities Mission.Surat is listed as the second cleanest city of India as of 21 August 2020 according to the Swachh Survekshan 2020 on 20 August. It suffered a major pipeline fire which caused some damage.Surat, famous for its diamond cutting and polishing, is known as the Diamond City of India. The city has various engineering plants like Essar, Larsen and Toubro and RIL. Surat won the Netexplo Smart Cities Award 2019 with UNESCO in the resilience category. Surat's mayor will receive the award at the UNESCO House in Paris, France in March next year.