Eastern coastal plains in the context of "Northern Circars"

Kalinga is a historical region of India. It is generally defined as the eastern coastal region between the Ganges and the Godavari rivers, although its boundaries have fluctuated with the territory of its rulers. The core territory of Kalinga now encompasses all of Odisha and some part of northern Andhra Pradesh. At its widest extent, the Kalinga region also included parts of present-day Chhattisgarh, extending up to Amarkantak in the west. In the ancient period it extended until the bank of the Ganges river.

The Kalingas have been mentioned as a major tribe in the legendary text Mahabharata. In the 3rd century BCE, the region came under Mauryan control as a result of the Kalinga War. It was subsequently ruled by several regional dynasties whose rulers bore the title Kalingādhipati ("Lord of Kalinga"); these dynasties included Mahameghavahana, Vasishtha, Mathara, Pitrbhakta, Shailodbhava, Bhaumkara, Somavamshi, and Eastern Ganga. The medieval era rulers to rule over the Kalinga region were the Suryavamsa Gajapatis, Bhoi dynasty, Paralakhemundi Gangas and the zamindaris of Ganjam and Vizagapatam.

India is a union of twenty-eight states and eight union territories. As of 2011, with an estimated population of 1.210 billion, India occupies 2.4 percent of the world's land surface area but is home to 17.5 percent of the world's population. The Indo-Gangetic plains are among the most densely populated areas of the world. The eastern and western coastal regions of Deccan Traps are also densely populated regions of India. The Thar Desert in western Rajasthan is one of the most densely populated deserts in the world. The northern and north-eastern states along the Himalayas contain cold arid deserts with fertile valleys. These states have less population density due to indomitable physical barriers.