Oslo occupies an arc of land at the northernmost end of the Oslofjord and is surrounded by green hills and mountains. Although its population is small compared with that of most European capitals (at about 660,000), the urban area is unusually spread out. There are 40 islands within the city limits and no fewer than 343 lakes. Oslo is one of the few major cities where people live with the wilderness literally in their backyards. Suburban train lines allow the fortunate inhabitants to simply step out of the carriage and start hiking or skiing. The city is an important maritime center and hosts some of the world’s largest shipping companies, ship brokers and insurance brokers.