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is a small town in the Southeast Fairbanks Census Area, Alaska, United States. According to 2005 Census Bureau estimates, the population of the town is 897. The city is located a short distance south of the confluence of the Delta River with the Tanana River, which is at Big Delta. It is about 160 km (99 miles) south of Fairbanks.
According to the United States Census Bureau, the city has a total area of 17.3 square miles (44.7 km²), all of it land.
"Big Delta" lies at the intersection of the Delta River and the Tanana River. The City of Delta Junction sits on the Delta River at the intersection of the Richardson Highway and the famed Alaska Highway (actually, the end of the Alaska Highway). The city and Delta community lie within the fertile Tanana River valley. Three mountain ranges -- the White Mountains to the north, the Granite Mountains to the southeast, and the Alaska Range to the southwest -- and the Delta River to the west surround the town.
Once overlain by glaciers, the geology is marked by glacial moraines as well as alluvial deposits from the Delta and Tanana Rivers. Numerous mineral deposits are found in the vicinity of Delta Junction ranging from gold to molybdenum to coal. A prominent natural feature on the landscape is Donnelly Dome, located within the Donnelly Training Area of Fort Wainwright (formerly a part of nearby Fort Greely until 2001), to the south of Delta Junction. This dome was formed as a glacier coming from the Alaska Range split in two, carving away sides of a former mountain.