The correct answer is 11098.8 km. Explanation & Key Takeaways: • The official length of India's coastline has been revised to 11098.8 km based on updated measurements and assessments. • This revised figure includes the coastlines of the mainland India as well as the territories of the Andaman and Nicobar Islands and Lakshadweep. • Earlier estimates of the coastline length were around 7516.6 km, but the updated measurement incorporates advanced techniques like geospatial mapping and coastal surveys. • The measurement includes both the eastern coastline (Bay of Bengal) and the western coastline (Arabian Sea), along with the lengths of the islands' shores. • This revision is important for various sectors, including fisheries, coastal development, maritime security, and disaster management. Related Concepts: • Importance of India's Coastline: • India's coastline provides access to 12 major and 200 minor ports, facilitating trade and economic growth. • It supports a thriving marine biodiversity and serves as a source of livelihood for millions of people dependent on fishing and aquaculture. • The coastline is vital for national security and monitoring maritime boundaries. • It plays a critical role in tourism, with popular destinations including Goa, Kerala, and Andaman & Nicobar Islands. • Geographical Division of India's Coastline: • The western coastline includes Gujarat, Maharashtra, Goa, Karnataka, and Kerala. • The eastern coastline consists of Tamil Nadu, Andhra Pradesh, Odisha, and West Bengal. • The island territories include Andaman & Nicobar Islands in the Bay of Bengal and Lakshadweep in the Arabian Sea. • Coastal Erosion and Management: • Nearly 40% of India's coastline is prone to erosion due to natural processes like wave action, sea-level rise, and human activities such as construction and sand mining. • The government has initiated programs like the Integrated Coastal Zone Management Project (ICZM) to combat erosion and preserve coastal ecosystems. • Economic Activities Along the Coastline: • India's maritime trade accounts for a significant portion of the economy, with over 90% of trade volume and 70% of trade value being sea-borne. • The development of coastal infrastructure, such as Sagarmala Project, aims to modernize ports and enhance connectivity. • Marine Biodiversity: • The coastline is home to diverse ecosystems like mangroves, coral reefs, estuaries, and lagoons, which are crucial for maintaining ecological balance. • Key species include olive ridley turtles, dugongs, and a variety of fish and shellfish.