Tyuleniy is 1.6 Km in length and 850 m wide.
There are many seals in Tyuleniy's shores and its surrounding waters, hence its name which means "seal" in Russian. It was formerly called "Robben Island" from the German name for seal. Seabirds of different species are also abundant on Tyuleniy.
Administratively Tyuleniy Island belongs to the Sakhalin Oblast of the Russian Federation.
The "Tyuleniy Virus", a group B arbovirus, was recovered in 1969 on Tyuleniy Island from ticks on birds.
& Seabird population