Nauvoo (Hebrew: נָאווּ, Modern Navu Tiberian Nâwû ; “to be beautiful”) is a small city in Hancock County, Illinois, United States. Although the population was just 1,063 at the 2000 census, and despite being difficult to reach due to its location in a remote corner of Illinois, Nauvoo attracts large numbers of visitors for its historic importance and its religious significance to members of both The Church of Jesus Christ of Latter-day Saints and the Community of Christ (formerly Reorganized Church of Jesus Christ of Latter Day Saints), other groups stemming from the Latter Day Saint movement, and groups such as the Icarians. The city and its immediate surrounding area are listed on the National Register of Historic Places as the Nauvoo Historic District.
Nauvoo is located at 40°33′N 91°22′W / 40.55°N 91.367°W / 40.55; -91.367 (40.5446, -91.3803). Situated on a wide bend in the Mississippi River, Nauvoo has most of the historic district in the lower flat lands (called the flats) that are no more than a few feet above the water line. A prominent hill rises as one moves further east, at the apex of which stands the rebuilt Nauvoo Temple. Beginning with the temple, this elevated land (called the hill) continues flat for many miles eastward.
According to the United States Census Bureau, the city has an area of 4.8 square miles (12.5 km²). 3.4 square miles (8.8 km²) of it is land and 1.4 square miles (3.7 km²) of it (29.88%) is water.