One of-a-kind natural phenomena where thousands of turtles come to shore to lay their eggs. This is only one of the three locations in the world where it can be experienced.

The beach of Ostional is the scenery for a rarely-seen biological wonder. In rainy season, the week before new moon, hundreds – and sometimes hundreds of thousand sea turtles come to one specific mile of beach at Ostional to dig their eggs into the black, volcanic sand.

Turtles nest at Ostional year round, but peak time is during rainy season. From August through December arribadas occur regularly once, sometimes even twice a month, and the numbers of nesting females are in the range of hundreds of thousands as opposed to tens of thousands for the dry season months. Usually the arribadas occur during the darkest nights: a few days before the new moon, when the majority of turtles arrives between 8 pm and 4 am.

The largest “arribada” thus far recorded in Ostional, took place in November 1995 when a calculated 500 000 females came ashore.

The turtles generally ride in on the high tide at night but during an arribada they start arriving soon after sunset and keep coming until 6 am the next morning.

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