Dutch Harbor lies within the city limits of Unalaska and is connected to it by a bridge. It is the 12th largest incorporated city in Alaska and is 800 miles southwest of Anchorage. It was named Dutch Harbor by the Russians, because they believed a Dutch ship was the first to be there. It is the heart of the Pacific/Bering Sea fisheries. There are about 4,768 residents living there. The economy there for the past 30 years has been based mostly on the fishing industry with seafood processing, fleet services, and marine transportation. Dutch is the only year-round deep draft ice-free port from Unimak Pass to Adak and north to the headwaters of the Bering Straits. It has been designated as a "Port of Refuge." About one million tons of frozen seasfood is shipped out of Dutch yearly.