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Book No. – 16 (Ancient History)
Book Name – A History of South India (K.A. Nilakanta Sastri)
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The Land in Relation to History
Chapter – 2

The chapter focuses on the geography of the country, particularly the land south of the Vindhyas, which is a rugged mountainous tract extending east to west along the Tropic of Cancer.
The northern side of the Vindhyas is gentle, while the southern side features a steep fall to the valley of the Narmada and a mountain wall formed by the Satpura-Mahadeo-Maikal range.
The Tapti River flows parallel to the Narmada to the west, and the Mahanadi flows eastward to the Bay of Bengal.
This geographical division does not hinder communication between the north and south, and historically, the two regions have influenced each other politically and culturally.
Before British rule, the North and South were united under several empires, such as the Mauryas and Guptas.
The peninsula juts out into the Indian Ocean, between the Arabian Sea and the Bay of Bengal, narrowing to a point at Cape Comorin.
The Malabar and Coromandel coasts extend for a thousand miles, with few natural harbors, although places like Cochin, Goa, and Bombay offer safe anchorages.
Peninsular India developed and maintained maritime trade with nations across the Bay of Bengal and was involved in the colonization of eastern lands.
Rulers like the Satavahanas, Pallavas, and Cholas were known for maintaining a strong navy.
The Malabar coast had a reputation for piratical activity, while Chola mariners were considered experts on sailing conditions in the Indian Ocean.
An early account of maritime trade in the region is found in the Periplus of the Erythraean Sea.
The nucleus of the peninsula is a triangular block of very old rocks, forming a plateau from the Satmala-Ajanta ranges to the Nilgiris.
The western edge is the Western Ghats, which are a steep sea-wall overlooking the west coast, with peaks rising up to 8,760 feet at the Nilgiris.
South of the Nilgiris, the Western Ghats have a gap called Palghat or Coimbatore gap, providing access from the Carnatic to the Malabar coast.
South of this gap, the ghats rise to Anaimudi Peak (8,841 feet), and the range terminates at Cape Comorin.
The crest line of the ghats is generally 50 to 100 miles from the Arabian Sea, with cliffs restricting the width of the coastal plain in some places.
North of Goa, the ghats are covered by basaltic lava-flows (Deccan trap), which have created natural citadels, important as military positions during the Maratha era.
South of Goa, the ghats are composed of more resistant materials like gneisses and schists.
The seaward face of the ghats is covered with dense forests, and passes inland from the coast are few.
The Trimbak Pass at the source of the Godavari was a historic trade route and an early settlement area for Aryans.