Sestra, mountain in Partizansky District, Primorsky Krai, Russia

Sestra is a 320-metre hill in Partizansky District, Primorsky Krai, near Nakhodka at the mouth of the Partizanskaya River. It is the eroded remnant of a reef about 250 million years old, made of white marbleised limestone like the neighbouring hill Brat. The conical, rounded summit is covered with low Mongolian oak, and a band of sea fog often rests on it in summer mornings.

In 1909, during the war with Japan, peasant Methodius Kolesnikov of the village of Vladimiro-Alexandrovskoye built a small wooden house on Sestra for a military guard of the Suchan coast; the guard was withdrawn in 1909, and in 1911 the fate of the house was decided. Sestra was designated a nature monument of Primorsky Krai in 1984. In 2008 a local entrepreneur proposed a ski base on the eastern slope, but Nakhodka authorities did not support it.

The main trail to the summit starts at the beach in Lashkevich Bay and follows the southwestern ridge; the climb takes about 45 minutes at an easy pace, or 20 for fit hikers. A second, lesser-known trail on the eastern slope is steeper and leads to the northeastern summit; after leaving the paved road, turn right onto the forest road. From June to September the summit is often wrapped in morning fog coming from the sea.

Sestra is an ancient reef about 250 million years old, made of white marbled limestone like the neighbouring hill Brat; the rock between them is a crag called Plemyannik ("Nephew"). In 2008 a local businessman proposed a ski resort on the eastern slope, but Nakhodka's authorities rejected the plan.