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Eastern coastal plain is located to the east of india from Tamilnadu to west bengal.
Western coastal plain is located to the west of india from kerala to gujarat.
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keerthika your map is old it is not having Telangana
Eastern coastal plain of India is located in eastern India from Tamil Nadu to West Bengal which includes Andhra Pradesh, Telangana, Odisha too. 
Western coastal plain of India is located in western India from Kerala to Gujarat which includes Karnataka, Maharashtra too.
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