Krishna River in the context of "Hyder Ali"

South India, also known as Southern India or Peninsular India, is the southern part of the Deccan Peninsula in India encompassing the states of Andhra Pradesh, Karnataka, Kerala, Tamil Nadu and Telangana as well as the union territories of Lakshadweep and Puducherry, occupying 19.31% of India's area (635,780 km or 245,480 sq mi) and 20% of India's population. It is bound by the Bay of Bengal in the east, the Arabian Sea in the west and the Indian Ocean in the south. The geography of the region is diverse, with two mountain ranges, the Western and Eastern Ghats, bordering the plateau heartland. The Godavari, Krishna, Kaveri, Penna, Tungabhadra and Vaigai rivers are important non-perennial sources of water. Chennai, Bengaluru, Hyderabad, Coimbatore and Kochi are the largest urban areas in the region.

The majority of the people in South India speak at least one of the four major Dravidian languages: Telugu, Tamil, Kannada and Malayalam. During its history, a number of dynastic kingdoms ruled over parts of South India, and shaped the culture in those regions. Major dynasties that were established in South India include the Cheras, Cholas, Pandyas, Pallavas, Satavahanas, Chalukyas, Hoysalas, Rashtrakutas and Vijayanagara. European countries entered India through Kerala and the region was colonized by Britain, Portugal and France.

Ujjain (/uːˈdʒeɪn/ , Hindi: [ʊd͡ːʒɛːn̪], Hindi: [əʋən̪t̪ɪkaː]), also known as Ujjayini, is a city in Ujjain district of the Indian state of Madhya Pradesh. It is the fifth-largest city in Madhya Pradesh by population and is the administrative as well as religious centre of Ujjain district and Ujjain division. It is one of the Hindu pilgrimage centres of Sapta Puri famous for the Kumbh Mela (Simhastha) held there every 12 years. The ancient and world famous temple of Mahakaleshwar Jyotirlinga is located in the center of the city. The city has been one of the most prominent trade and political centres of the Indian subcontinent from the time of the ancient Mahājanapadas until the British colonisation of India.

An ancient city situated on the eastern bank of the Shipra River, then known as Avantika,, it was the most prominent city on the Malwa plateau of central India for much of its history. It emerged as the political centre of central India around 600 BCE. It was the capital of the ancient Avanti kingdom, one of the sixteen Mahājanapadas. During the 18th century, the city briefly became the capital of the Scindia state of the Maratha Confederacy, when Ranoji Scindia established his capital at Ujjain in 1731. It remained an important political, commercial, and cultural centre of Central India until the early 19th century, when the British administrators decided to develop Indore as an alternative to it. Ujjain continues to be an important place of pilgrimage for Shaivites, Vaishnavites and Shaktas. Bathing in the holy Shipra river of Ujjain liberates one from sins. Therefore, Ujjain is also called the 'Mokshadayini city'. The name of this river is taken among the holy rivers like Kaveri, Narmada, Godavari and Krishna.

The Vijayanagara Empire, also known as the Karnata Kingdom, was a late medieval Hindu empire that ruled much of southern India. It was established in 1336 by the brothers Harihara I and Bukka Raya I of the Sangama dynasty, belonging to the Yadava clan of Chandravamsa lineage.

The empire rose to prominence as a culmination of attempts by the southern powers to ward off Muslim invasions by the end of the 13th century. At its peak in the early 16th century under Krishnadevaraya, it subjugated almost all of Southern India's ruling dynasties and pushed the Deccan sultanates beyond the Tungabhadra-Krishna River doab region, in addition to annexing the Gajapati Empire (Odisha) up to the Krishna River, becoming one of the most prominent states in India. The empire's territory covered most of the lands of the modern-day Indian states of Karnataka, Andhra Pradesh, Tamil Nadu, Goa, and some parts of Telangana, Maharashtra and Kerala.

The Deccan sultanates is a historiographical term referring to five late medieval to early modern Persianate Muslim kingdoms on the Deccan Plateau between the Krishna River and the Vindhya Range. They emerged after the disintegration of the Bahmani Sultanate and were ruled by various dynasties: Ahmadnagar, Berar, Bidar, Bijapur, and Golconda. Ahmadnagar was the first to declare independence, in 1490; followed by Bijapur and Berar in the same year. Bidar became independent in c. 1492, and Golconda in 1512.

Although the five sultanates were all ruled by Muslims, their founders were of diverse origins: the Nizam Shahi dynasty, the ruling family of the Ahmadnagar Sultanate, was founded by Malik Hasan Bahri, a Marathi Muslim of Brahmin origin; the Berar Sultanate by a Kannadiga Muslim of Brahmin origin; the Bidar Sultanate by a Georgian slave; the Bijapur Sultanate by a foreigner who may have been a Georgian slave purchased by Mahmud Gawan; and the Golconda Sultanate by a slave of Iranian Turkmen origin.

The Eastern Coastal Plains is a stretch of landmass lying between the eastern part of the Deccan Plateau and the Bay of Bengal in India. The plains stretch from the Mahanadi delta to Kaniyakumari at the southern tip of the Indian peninsula with the Eastern Ghats forming its rough western boundary. It is wider and leveled than the Western Coastal Plains and traverses the states of Odisha, Andhra Pradesh, and Tamil Nadu.

The plains are broadly divided into three subdivisions–Utkal Plains in the north, Andhra plains in the center, and Tamil Nadu plains in the south. The plains are fertile as it forms part of the deltas of major peninsular rivers such as Godavari, Krishna, Mahanadi, and Kaveri.

The Kaveri (also known as Cauvery, Tamil: [kɑːʋɪɾi]) is a major river flowing across Southern India. It is the third largest river in the region after Godavari and Krishna. The catchment area of the Kaveri basin is estimated to be 81,155 km (31,334 sq mi) and encompasses the states of Tamil Nadu, Karnataka, Kerala, and the union territory of Puducherry.

The river rises at Talakaveri in the Brahmagiri range in the Western Ghats. The source is located at an elevation of 1,341 m (4,400 ft) in the Kodagu district of Karnataka. The river flows for about 320 km (200 mi) through the Deccan Plateau in Karnataka before entering Tamil Nadu. It flows further eastward in Tamil Nadu for 416 km (258 mi) before flowing into the Bay of Bengal near Poompuhar in Mayiladuthurai district of Tamil Nadu. The river flows for a total length of about 800 km (500 mi). The major tributaries include Amaravati, Arkavati, Bhavani, Harangi, Hemavati, Kabini, Lakshmana Tirtha, Shimsha and Noyyal.

The Tungabhadra River (Kannada: [t̪uŋɡɐbʱɐd̪rɐ]) starts and flows through the state of Karnataka, India, for most of its course, then through Andhra Pradesh where it ultimately joins the Krishna River near Murvakonda.

The Tungabhadra derives its name from two streams, the Tunga, about 147 km (91 mi) long, and the Bhadra, about 178 km (111 mi) long, which rise in the Western Ghats (Sahyadri mountains). The river after the confluence of the two streams in Koodali near Shimoga runs for about 531 km (330 mi) till it joins the river Krishna at Sangamaleshwaram in Andhra Pradesh. It runs for 382 km (237 mi) in Karnataka, forms the boundary between Karnataka and Andhra Pradesh for 58 km (36 mi) and further runs for the next 91 km (57 mi) in Andhra Pradesh. The total catchment area of the river is 69,552 km (26,854 sq mi) up to its confluence with the Krishna and it is 28,177 km (10,879 sq mi) up to Tungabhadra Dam. It is influenced chiefly by the South-West monsoon. It is a perennial river, but the summer flows dwindle to as low as 2.83 to 1.42 cumec (100 to 50 cusec).