According to the United States Census Bureau, the town has a total area of , of which are land and , or 4.72%, are water. Within Salisbury there are several ponds and six lakes: Wononscopomuc, Washinee, Washining, Wononpakook, Riga Lake and South Pond. The Housatonic River forms the eastern boundary of the town. Although the summit of Mount Frissell lies in Massachusetts at an elevation of , the south slope of the mountain in Salisbury, is the highest point in Connecticut at .