<P> The best feeding ground of sea turtles may not be the best nesting ground for them . The sea turtles migrate thousands of kilometres to meet both the ends . It has been observed that Olive Ridley sea turtles migrate from the coastal water of Sri Lanka in the Indian ocean to the coastal water of Gahirmatha in the north . The' Homing' characteristics and the uncanny ability to orient itself in open sea help the sea turtles to migrate over long distance without getting lost in the vastness of the sea . Mating Immediately after the arrival of ridley sea turtles in the coastal water of Gahirmatha, they indulge in matting activities . Males mount over the females and are often seen floating on the surface with the intermittent movement of flippers . Sometimes more than one male is seen mounting over one female . The courtship continues for hours unless there is any external threat . A female will continue to mate with several males throughout the breeding season . Mostly the mating pairs are seen off the coast of Ekakula . Nesting The mass nesting behaviour of Olive ridley sea turtles is known as "Arribada". Thousands of female carrying turtles scramble on the nesting beach at Nasi - I & II islands to release the eggs in flask shaped cavities . The turtles scoop the soft sand to a depth of 45 cm with the help of flippers and release 100 to 180 eggs . Before scampering on to the beach, the turtles survey the nesting ground from the sea and in case they smell and danger, they shun the beach and search for safer breeding ground . The urge to release the egg is so intense that they are so oblivious of the presence of any foreigner, at the time of nesting . Generally dark nights are preferred by the ridleys for nesting . It has been observed that nesting takes place once the southernly wind starts blowing . The period of emergence and retreat into the sea after nesting takes 45 to 55 minutes . Due to the shrinkage of the nesting beach, over crowding of turtles is observed during nesting . The eggs which are scooped out by successive nesters is known as "doomed" egg as it would never be able to hatch . Sporadic nesting is also not uncommon . These eggs are mostly damaged by predators . The nesting females emit hissing noise at the time of laying eggs as the intake of oxygen is maximum at that moment . After laying eggs, the female turtle fills up the pit with sand by the flippers and tries to camouflage the pit site . The mother turtle, rams the pit with the help of its body weight . </P> <P> The eggs inside the flask shaped pits, being incubated by sun and the metabolic heat, hatch after 50 to 60 days . The hatching takes place during 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 . After the emergence of hatchlings, they immediately head for the open sea . The tiny replicas of turtles are in a frenzy to enter the sea water . This is the most spectacular sight . The hatchlings orient themselves by the reflection of stars on sea water or by the brighter horizon and head en masse towards the sea . The hatchlings swim deep into the sea until they reach the sea current . During this period large scale mortality of hatchlings take place . It is studied that 1 in 1000 survives . Bigger fishes, ghost crabs or seagulls either predates the hatchlings . Then the period of "lost year" begins . </P>

Which of these sanctuaries is located on the coast between paradip and chandipur