Solution:The coastal states of India include Kerala, Tamil Nadu, Gujarat, West Bengal, Goa, Karnataka, Maharashtra, Andhra Pradesh, and Odisha. The coastal union territories are Daman & Diu, Puducherry, Lakshadweep Islands, and Andaman & Nicobar Islands. India's extensive coastline, measuring 7,516.6 km, includes 5,422 km of mainland coastline and 2,094 km belonging to island territories.
This coastline spans 9 states and 4 union territories, bordered by the Arabian Sea and Indian Ocean on the west and the Bay of Bengal on the east. Among the coastal states, Gujarat has the longest coastline, while Andaman & Nicobar Islands lead among union territories.