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In page Geography of Kerala:

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Finally, Kerala's coastal belt is relatively flat, teeming with paddy fields, groves of coconut trees, and heavily crisscrossed by a network of interconnected canals and rivers. The comparative water-richness of the coastal belt can be partly gauged by the fact that Kuttanad, with its backwaters canals and rivers, itself comprises more than 20% of India's waterways by length. The most important of Kerala's forty-four rivers include the Periyar (244 km in length), the Bharathapuzha (209 km), the Pamba River (176 km),the chaliyar river(169) the Chalakudy Puzha(144 km), the Kadalundipuzha (130 km), and the Achancoil (128 km). Most of the remainder are small and entirely fed by the Monsoons.