Korsakov() is a port city in Sakhalin Oblast, located a the southern tip on the island, while rather drab with few things to entertain the visitor, it does host one of the two ferry connections between Russia and Japan.
There are infrequent connections by a narrow gorge railway from Yuzhno Sakhalinsk, but services are random and far between, busses are far more convenient.
There are both scheduled, and - leave when full - mini bus connections between Yuzhno Sakhalinsk and Korsakov. both depart for Korsakov in front of the Yuzhno Sakhalin railway station. Mini busses are the most convenient, ask around the different drivers, they will point you to the right bus.
Ferries operated by Heartland ferry, depart weekly from the international sea terminal in Wakkanai, on the northern tip of Hokkaido, Japan.
Unscheduled minibusses and taxis provide the citys very limited transportation.
There are very little in the way of sights in Korsakov. But there is a great view over the habour, along with an uninspiring monument, on the hill just behind the sea terminal.
There is a few restaurants located along the the main drag, going south from the central Lenin square. Also, The restaurant inside Hotel Alpha has an English menu.
The Penguin bar, is a short walk of the seaterminal, you may even meat the occational foreign oil worker og seaman here if you are extremely lucky.
The citys only Hotel is Hotel Alpha, is recently renovated, and located on the northwestern end of Lenin square. Rates start from 6600 Rubles, but discounts are available if you talk to the manager, who speaks fairly good English.
The Post Office of Lenin Square, has two computers with Internet access
Ferrys depart for Wakkanai on Hokkaido, Japan, from the seaterminal (Морвокзал) on the southern pier (Южно порт). Ticket sales in Korsakov are handled by the Inflot agency, their office is on the 1st floor of the the large 3 storey Upravlinie building next to the sea terminal.
There are also ferry services to the Kuril islands and the mainland, but schedules and let alone tickets, are very hard to come by if you dont speak Russian, a much easier option to the mainland, is to take the daily scheduled ferry from Kholmsk.