Porkhovsky District in the context of "Pskovsky District"

Ostrovsky District (Russian: О́стровский райо́н) is an administrative and municipal district (raion), one of the twenty-four in Pskov Oblast, Russia. It is located in the west of the oblast and borders with Pskovsky District in the north, Porkhovsky District in the northeast, Novorzhevsky District in the southeast, Pushkinogorsky and Krasnogorodsky Districts in the south, Pytalovsky District in the west, and with Palkinsky District in the northwest. The area of the district is 2,400 square kilometers (930 sq mi). Its administrative center is the town of Ostrov. Population: 31,096 (2010 census); 36,685 (2002 Census); 14,199 (1989 Soviet census). The population of Ostrov accounts for 69.7% of the district's total population.

The Cheryokha (Russian: Черёха) is a river in Ostrovsky, Porkhovsky, and Pskovsky Districts, and in the city of Pskov of Pskov Oblast in Russia. It is a right tributary of the Velikaya and belongs to the basin of the Narva. It is 145 kilometres (90 mi) long, and the area of its basin 3,230 square kilometres (1,250 sq mi). The main tributary is the Keb (right).

The source of the Cheryokha is Lake Chereshno, located in a swampy area southeast of the town of Ostrov. The river flows northwest, enters Porkhovsky District, and close to the border with Pskovsky District sharply turns west. On a short stretch it makes the border between Porkhovsky and Pskovsky Districts. In 8.7 kilometres (5.4 mi) upstream from the mouth the Cheryokha accepts the Keb, its biggest tributary, from the right. The last stretch of Cheryokha constitutes the border between the city of Pskov (north) and Pskovsky District (south). The Cheryokha joins the Velikaya in the southern end of the city of Pskov.