The beach is part of Gahirmatha Marine Wildlife Sanctuary, which also includes the adjacent portion of the Bay of Bengal.
Apart from Gahirmatha rookery, two other masses are there where nesting beaches have been located which are at the mouth of rivers Rushikulya and Devi.
The spectacular site of the mass congregation of olive ridley sea turtles for mating and nesting enthralls both the scientists and the nature lovers throughout the world.
In this month, it was reported by forest officials that at least two lakh (200,000) baby olive ridley turtles have come out of their pits within a span of 24 hours.
Olive ridley sea turtles migrate in huge numbers from the beginning of November, every year, for mating and nesting along the coast of Odisha.
Olive ridley sea turtle has found place in Schedule - I of Indian Wildlife (Protection) Act, 1972 (amended 1991).
All the species of sea turtles in the coastal water of Odisha are listed as "vulnerable" as per IUCN Red Data Book.
Thousands of female carrying turtles scramble on the nesting beach at Nasi - I & II islands to release the eggs in flask-shaped cavities.
The nesting females emit hissing noise at the time of laying eggs as the intake of oxygen is maximum at that moment.
The eggs inside the flask-shaped pits, being incubated by the sun and the metabolic heat, hatch after 50 to 60 days.
The hatching takes place during the night or in the predawn period to avoid predation by jackals, dogs, and birds.
The walls of the pit gradually collapse, thereby allowing the eggs on the lower strata to rise upwards.
The hatchlings orient themselves by the reflection of stars on seawater or by the brighter horizon and head en masse towards the sea.