Severe Coastal Erosion at Gahirmatha Delays Olive Ridley Turtle Nesting
In a concerning development for wildlife conservation, severe coastal erosion has destroyed large stretches of beach on Nasi-1 and Nasi-2 islands within the Gahirmatha Marine Sanctuary in Odisha. This environmental crisis has delayed the much-anticipated mass nesting of Olive Ridley sea turtles at what is recognized as the world's largest rookery for this endangered species.
Contrasting Nesting Patterns Highlight the Problem
While over two lakh Olive Ridley turtles successfully nested at Rushikulya beach in Ganjam district between March 14 and 17, the complete absence of nesting activity at Gahirmatha has baffled researchers and environmentalists. This stark contrast is particularly alarming given last year's successful nesting season, when more than six lakh turtles laid eggs between March 5 and 10 across Nasi-1, Nasi-2, and Eakakulanasi beaches.
Decades of Erosion Culminate in Critical Beach Loss
Kapilendra Pradhan, forest range officer of Gahirmatha Marine Sanctuary, provided detailed insights into the severity of the situation. "Both the uninhabited islands of Nasi-1 and Nasi-2 in the Bay of Bengal were famous for nesting of the sea turtles, and these islands have been facing coastal erosion problems for more than two decades," Pradhan explained. "Forest officials have recently noticed submergence of large areas of both islands."
The physical transformation of these nesting sites is dramatic and concerning:
- Nasi-1 island has shrunk from 1.5 kilometers in length a decade ago to just 100 meters today
- Nasi-2 island has reduced from 2 kilometers to approximately 300 meters
- Both beaches have become vertically steep with 90-degree angles, making it nearly impossible for turtles to access potential nesting grounds
Historical Context and Shifting Nesting Patterns
Environmentalist Hemant Rout provided historical context to the current crisis. "The 12-kilometer long Gahirmatha beach has faced major obstacles due to changing patterns of the beach," Rout noted. "The beach extending into the sea north of Eakakulanasi in Gahirmatha was split into several parts during the 1982 cyclone. Consequently, the higher rate of congregation of Olive Ridley sea turtles shifted to the two tiny Nasi-1 and Nasi-2 islands."
The erosion problem has claimed other nesting sites in recent years. Five years ago, the 1.5-kilometer-long Agranasi island, another important nesting site for sea turtles, completely vanished into the sea due to relentless erosion.
Glimmer of Hope Amid Environmental Challenges
Despite the dire situation on Nasi-1 and Nasi-2 islands, there is some positive news from within the sanctuary. "Last year, Eakakulanasi beach within the sanctuary witnessed significant accretion, resulting in a wider, stable sandy beach covering 5 kilometers," Pradhan added. "Turtles will likely lay eggs on Eakakulanasi beach soon, providing an alternative nesting site."
Broader Coastal Erosion Context in Odisha
The situation at Gahirmatha reflects broader coastal challenges facing Odisha. According to data presented by Kirti Vardhan Singh, Minister of Environment, Forest and Climate Change, in the Rajya Sabha on August 22, 2025, the National Centre for Coastal Research under the Ministry of Earth Sciences has conducted comprehensive scientific studies on shoreline changes along the Indian coast.
The findings reveal that between 1990 and 2018:
- 128.77 kilometers (23.4%) of Odisha's shoreline remains stable
- 140.72 kilometers (25.6%) has experienced erosion
These statistics underscore the significant environmental challenges facing coastal regions in Odisha and highlight the urgent need for sustainable coastal management strategies to protect critical wildlife habitats like the Gahirmatha Marine Sanctuary.
