Kholmsk (Port Code:RUKHO) is an important seaport for Sakhalin Island. Since 1973, it has been the Sakhalin terminal of a Vanino-Kholmsk train ferry to the port of Vanino on the Russian mainland, connecting the mainline rail network with that of the island. Kholmsk (Russian: Холмск), known until 1946 as Maoka, is a port town and the administrative center of Kholmsky District of Sakhalin Oblast, Russia. It is located on the southwest coast of the Sakhalin Island, on coast of the gulf of Nevelsky in the Strait of Tartary of the Sea of Japan, 83 kilometers (52 mi) west of Yuzhno-Sakhalinsk. 
The port is open for navigation all the year round; however, due to its position size and weather conditions in the area, it cannot be used as a sheltering port. The port is divided into two parts: the Southern Harbour (Commercial Port); and the Northern harbour (Sakhalin Western Sea Port (SWSP)). Cargo berths are situated in both Northern and Southern harbours. SWSP supports the offshore energy industry.