Gustavus is a city in Hoonah-Angoon Census Area in the U.S. state of Alaska. According to the United States Census Bureau, the city has a total area of 38 square miles (98 square kilometers), all of it land. Gustavus is split by the Salmon River, across which there is a bridge for the paved road running out to Glacier Bay National Park. Coho salmon, Dolly Varden, and other fish are commonly caught in this river. Within the city limits, the river is affected by tides.