Idaho is a state in the Northwestern United States. The state's largest city and capital is Boise. Residents are called "Idahoans". It is a mostly mountainous state, and is the 14th largest state by land area, with an area larger than all of New England. It is landlocked, surrounded by the states of Washington, Oregon, Nevada, Utah, Wyoming, Montana and the Canadian province of British Columbia. However, the network of dams and locks on the Columbia River and Snake River make the city of Lewiston the farthest inland seaport on the west coast of the continental United States. According to the United States Census 2010, Idaho had a population of 1,567,582. The state's postal abbreviation is ID. Idaho's nickname is the Gem State because nearly every known gem has been found there. In addition, Idaho is one of only two places in the world where star garnets can be found, and is the only place six pointed star garnets have been found. The state motto is Esto Perpetua (Latin for "Let it be forever").