Formed in 1998, the municipality consists of the former townships of Caledonia, Cambridge and South Plantagenet, as well as the Village of St. Isidore.

The township comprises the communities of Benoit, Bradley Creek, Caledonia Springs, Fenaghvale, Forest Park, Fournier, Franklins Corners, Gagnon, Johnsons Ferry, Lalonde, Limoges, Longtinville, Martels Corners, Mayerville, Parkers Corners, Proulx, Riceville, Routhier, Sandown, Skye, St. Albert, St. Amour, St. Bernardin, Ste-Rose-de-Prescott, St. Isidore and Velfranc.

The Nation Municipality is home to Calypso Water Park near Limoges and the Alfred Bog.

Species of interest include the palm warbler, northern pitcher-plant, pink lady's slipper, cottongrass, bog elfin and bog copper butterflies, and ebony boghaunter dragonfly.

The bog is open to the public with a 272 m (892 ft) boardwalk for nature walks.