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.

Kochi ([koˈtːʃi ] (listen)), also known as Cochin ( KOH-chin) (the official name until 1996) is a major port city on the Malabar Coast of India bordering the Laccadive Sea, which is a part of the Arabian Sea. It is part of the district of Ernakulam in the state of Kerala and is commonly referred to as Ernakulam. Kochi is the most densely populated city in Kerala. As of 2011, it has a corporation limit population of 677,381 within an area of 94.88 km2 and a total urban population of more than of 2.1 million within an area of 440 km2, making it the largest and the most populous metropolitan area in Kerala. Kochi city is also part of the Greater Cochin region and is classified as a Tier-II city by the Government of India. The civic body that governs the city is the Kochi Municipal Corporation, which was constituted in the year 1967, and the statutory bodies that oversee its development are the Greater Cochin Development Authority (GCDA) and the Goshree Islands Development Authority (GIDA). The current metropolitan limits of Kochi include the mainland Ernakulam, Fort Kochi, the suburbs of Edapally, Kalamassery, Aluva and Kakkanad to the northeast; Tripunithura to the southeast; and a group of islands closely scattered in the Vembanad Lake. Called the "Queen of the Arabian Sea", Kochi was an important spice trading centre on the west coast of India from the 14th century onward, and maintained a trade network with Arab merchants from the pre-Islamic era. In 1505, the Portuguese established trading ports in Cochin. There are still buildings like the Old Harbour House from this period, some of which have been renovated in more recent times. The Kingdom of Cochin allied with the Ming Dynasty, Portuguese, and Dutch and became a princely state of the British. Kochi ranks first in the total number of international and domestic tourist arrivals in Kerala. The city was ranked the sixth best tourist destination in India according to a survey conducted by the Nielsen Company on behalf of the Outlook Traveller magazine. In October 2019, Kochi was ranked seventh in Lonely Planet's list of top 10 cities in the world to visit in 2020. Kochi was one of the 28 Indian cities among the emerging 440 global cities that will contribute 50% of the world GDP by 2025, in a 2011 study done by the McKinsey Global Institute. In July 2018, Kochi was ranked the topmost emerging future megacity in India by global professional services firm JLL.Kochi is known as the financial, commercial and industrial capital of Kerala. It has the highest GDP as well as the highest GDP per capita in the state. The city is home to the Southern Naval Command of the Indian Navy and is the state headquarters of the Indian Coast Guard with an attached air squadron, named Air Squadron 747. Commercial maritime facilities of the city include the Port of Kochi, an International Container Transshipment Terminal, the Cochin Shipyard, offshore SPM of the BPCL Kochi Refinery and the Kochi Marina. Kochi is home for the International Pepper Exchange, Marine Products Export Development Authority, Coconut Development Board, companies like HMT, Apollo Tyres, FACT, IREL, Petronet LNG, Kochi Refineries, V-Guard and industrial parks like the Cochin Special Economic Zone, Smart City, Infopark and Kinfra Hi-Tech Park. Kochi is home for the High Court of Kerala and Lakshadweep, Naval Physical and Oceanographic Laboratory, Indian Maritime University, Sree Sankaracharya Sanskrit University and the Cochin University of Science and Technology, National Law School and National University of Advanced Legal Studies. Kochi was earlier home to Cochin Stock Exchange (CSE). Kochi has been hosting India's first art biennale, the Kochi-Muziris Biennale, since 2012, which attracts international artists and tourists.