Updated India’s Coastline Length
Kartavya Desk Staff
Syllabus: Geography
Source: TH
Context: The Ministry of Home Affairs, in its 2023–24 report, updated India’s coastline length to 11,099 km, up from 7,516.6 km.
• The change stems not from land gain but due to better mapping precision, highlighting the coastline paradox.
About Updated India’s Coastline Length:
India’s Coastline Length – Key Overview:
• Previous Length: 7,516.6 km (based on 1970s maps at 1:4,500,000 scale).
• Revised Length: 11,098.8 km (as of Dec 2024).
• States Involved: 11 coastal States + 2 UTs (Andaman & Nicobar, Lakshadweep).
• Key Feature: Longest coastline among Indian states — Gujarat (~1,600 km).
• No New Land Added: No change in national borders or geological expansion.
Measurement Methodology:
• Agencies Involved: National Hydrographic Office (NHO) and Survey of India.
• Technology Used: Scale: 1:250,000 electronic navigation charts. Tools: GIS, LIDAR-GPS mapping, drone imaging, satellite altimetry.
• Scale: 1:250,000 electronic navigation charts.
• Tools: GIS, LIDAR-GPS mapping, drone imaging, satellite altimetry.
• Reference Line: Highwater line from 2011 data, closing river mouths at standard inland points.
• Mapped Features: Tidal creeks, estuaries, sandbars, low-tide islands.
Implications for India:
• Maritime Security: Longer coastline means more area to surveillance and protects (e.g. post-26/11 coastal radar grid). Coastal policing and Navy deployment need revaluation.
• Longer coastline means more area to surveillance and protects (e.g. post-26/11 coastal radar grid).
• Coastal policing and Navy deployment need revaluation.
• Disaster Management: Critical for cyclone, tsunami, and sea-level rise preparedness (e.g., Odisha’s early warning systems). Enhances accuracy in coastal zone regulation (CRZ) mapping.
• Critical for cyclone, tsunami, and sea-level rise preparedness (e.g., Odisha’s early warning systems).
• Enhances accuracy in coastal zone regulation (CRZ) mapping.
• Economic Zoning: Impacts EEZ (Exclusive Economic Zone) calculation and fishing rights allocation. Coastal States like Tamil Nadu and Kerala can gain blue economy leverage.
• Impacts EEZ (Exclusive Economic Zone) calculation and fishing rights allocation.
• Coastal States like Tamil Nadu and Kerala can gain blue economy leverage.
• Infrastructure Planning: Better data for ports, shipping lanes, and coastal tourism (e.g., Sagarmala project).
• Better data for ports, shipping lanes, and coastal tourism (e.g., Sagarmala project).
Significance of Increasing Coastline:
• Reflects scientific progress: Not territorial gain, but enhanced precision through modern cartography.
• Strengthens policy decisions: Data-backed planning for coastal development, biodiversity protection, and climate resilience.
• Reinforces India’s maritime identity: Supports India’s goal of becoming a Blue Economy leader.
Conclusion:
The revised coastline is the outcome of advanced geospatial technologies, not any physical expansion of land. It strengthens India’s capacity to safeguard, develop, and sustainably manage its coastal regions. This shift highlights how scientific progress—rather than natural changes—can redefine our understanding of geography.
• Comment on the resource potentials of the long coastline of India and highlight the status of natural hazard preparedness in these areas. (UPSC-2023)