The southern part of Hokkaido (Esashi, Hakodate, Hidaka, Muroran, etc.). Hakodate, where the ferry service used to operate, is the central city. The Hokkaido Shinkansen bullet train is now in operation.
Many of Donan's specialties are not products as they are, but rather processed and cultural items. Among them, "Ikameshi", the winner of the annual ekiben competition at Shinjuku keio department store, is cheap and delicious. It's interesting, and it represents ekiben.
The tourist attraction is, of course, Lake Toya.