South India is a peninsula in the shape of a vast inverted triangle, bounded on the west by the Arabian Sea, on the east by the Bay of Bengal and on the north by the Vindhya and Satpura ranges. The Narmada flows westwards in the depression between the Vindhya and Satpura ranges. The Satpura ranges define the northern spur of the Deccan plateau. The Western Ghats, along the western coast, mark another boundary of the plateau. The narrow strip of verdant land between the Western Ghats and the Arabian Sea is the Konkan region. The Western Ghats continue south, forming the Malenadu (Canara) region along the Karnataka coast, and terminate at the Nilgiri mountains, an inward (easterly) extension of the Western Ghats. The Nilgiris run in a crescent approximately along the borders of Tamil Nadu with northern केरळ and Karnataka, encompassing the Palakkad and Wayanad hills, and the Satyamangalam ranges, and extending on to the relatively low-lying hills of the Eastern Ghats, on the western portion of the Tamil Nadu - Andhra Pradesh border. The Tirupati and Annamalai hills form part of this range. The low lying coral islands of Lakshadweep are off the south-western coast of India. श्रीलंका lies off the south-eastern coast, separated from India by the Palk Strait and the chain of low sandbars and islands known as Rama's Bridge. The Andaman and Nicobar islands lie far off the eastern coast of India, near the Tenasserim coast of Burma. The southernmost tip of mainland India is at Kanyakumari (Cape Comorin) on the Indian Ocean.

The Deccan plateau is the vast elevated region bound by the C-shape defined by all these mountain ranges. No major elevations border the plateau to the east, and it slopes gently from the Western Ghats to the eastern coast. The plateau is watered by the east flowing Godavari and Krishna rivers. The other major rivers of the Deccan plateau are the Pennar and the Tungabhadra, a major tributary of the Krishna. The three major river deltas of South India, the Kaveri, the Godavari and the Krishna, are located along the Bay of Bengal. These areas constitute the "rice bowls" of South India.

The region has a very tropical climate with the monsoons playing a major part. The South - West Monsoon accounts for most of the rainfall in the region and much of it falls from about June to October. The south-west monsoon starts from केरळ during June and moves up towards the northern parts of India. Tamil Nadu and southeast Andhra Pradesh receive rains from the North - East Monsoon from about November to February.
Much of Andhra Pradesh and Karnataka has a distinct dry season from about October - May when there is not much rainfall. This region also experiences cooler nights from October to March while the days are pleasantly warm. In the northern parts of the region temperatures can fall below 10 degrees Celsius on occasions at night during this time. Days are very hot from March to June when temps can go over 40 degrees. The southern coastal region has an average minimum temperature of 20 degrees and maximum of 35 degrees.

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