 Other endangered whale species known to occur in this area are the North Pacific right whale, the bowhead whale, and the beluga whale.Transport, especially by sea, is an important segment of the economy.Nearly all the cargo arriving for Sakhalin (and the Kuril Islands) is delivered by cargo boats, or by ferries, in railway wagons, through the Vanino-Kholmsk train ferry from the mainland port of Vanino to Kholmsk.