Port Arthur

There is more than one place called Port Arthur:

Australia

 * Port Arthur (Tasmania) is a small town with a major historic site from Australia's days as a penal colony

Canada

 * Port Arthur (Ontario) was an independent city but has been merged into Thunder Bay

China

 * Port Arthur (Liaoning) was in the late 19th century a naval base contested by many powers. Nowadays the area is part of the Lüshunkou District of Dalian

United States of America

 * Port Arthur (Texas) is an oil town on the gulf coast