Noyyal River in the context of "Kongu Nadu"

Karur (Tamil: [kaɾuːɾ]) is a municipal corporation in the Indian state of Tamil Nadu. It is the administrative headquarters of Karur district and is administered by the Karur Municipal Corporation. It is located on the banks of the rivers Amaravathi, Kaveri and Noyyal. It is situated at about 395 km (245 mi) southwest of the state capital Chennai.

The region was ruled by the Cheras during the Sangam period and the town might have been part of the Chera capital at Vanchi-Karuvoor. It formed a part of the principal trade route between the west coast and Tamil Nadu. Archeological evidence points to Karur being a centre of trade during the Chera period. The region was ruled later by the Cholas, as evident from temple epigraphs. It was under the control of Pandyas, Vijayanagara Empire and the Madurai Nayaks across various periods in history. In the later part of the 18th century, the region came under the Kingdom of Mysore and the British East India Company annexed it to the Madras Presidency in 1799. After Indian Independence in 1947, it became pert of Madras State, the predecessor of Tamil Nadu.

Kongu Nadu (IPA: [koŋɡɯ n̪aːɖɯ]), also known as Kongu Mandalam, is the geographical region comprising the western and north-western part of the Indian state of Tamil Nadu and in some instances, parts of southeastern Karnataka and eastern Kerala. The region covers an area of roughly 60,895 km (23,512 sq mi) with a population of over 27.4 million.

The geography of the region is diverse, with the Western and Eastern Ghats traversing along the Deccan Plateau. The Kaveri, Bhavani, Amaravati and Noyyal rivers are the important non-perennial sources of water. Coimbatore, Tiruppur and Salem are the largest urban areas in the region. The majority of the people in the region speak Kongu Tamil, a variant of Tamil language. While the region is a significant contributor to the economy of the state, disparity remains within various districts in the region.

Coimbatore (Tamil: kōyamputtūr, IPA: [koːjɐmbut̪ːuːɾ] ), also known as Kovai (IPA: [koːʋaj] ), is a metropolitan city in the Indian state of Tamil Nadu. It is located on the banks of the Noyyal River and surrounded by the Western Ghats. It is the second largest city in Tamil Nadu after Chennai in terms of population and the 16th largest urban agglomeration in India as per the census 2011. It is the administrative capital of Coimbatore District and is administered by the Coimbatore Municipal Corporation which was established in 1981.

The region around Coimbatore was ruled by the Cheras during the Sangam period between the 1st and the 4th centuries CE and it served as the eastern entrance to the Palakkad Gap, the principal trade route between the west coast and Tamil Nadu. Coimbatore was located along the ancient trade route Rajakesari Peruvazhi that extended from Muziris to Arikamedu in South India. The medieval Cholas conquered the Kongu Nadu in the 10th century CE. The region was ruled by Vijayanagara Empire in the 15th century followed by the Nayaks who introduced the Palayakkarar system under which Kongu Nadu region was divided into 24 Palayams. In the later part of the 18th century, the Coimbatore region came under the Kingdom of Mysore and following the defeat of Tipu Sultan in the Anglo-Mysore Wars, the British East India Company annexed Coimbatore to the Madras Presidency in 1799. The Coimbatore region played a prominent role in the Second Poligar War (1801) when it was the area of operations of Dheeran Chinnamalai.