The Underwater Utopia of Vault 120 is a massive, safe nation, renowned for its barren, inhospitable landscape, frequent executions, and multi-spousal wedding ceremonies. The hard-working, democratic population of 2.168 billion Dwellers enjoy a sensible mix of personal and economic freedoms, while the political process is open and the people's right to vote held sacrosanct.

The relatively small, outspoken government juggles the competing demands of Welfare, Defense, and Healthcare. The average income tax rate is 16.7%.

The Dwellers economy, worth 116 trillion Caps a year, is fairly diversified and led by the Woodchip Exports industry, with major contributions from Book Publishing, Basket Weaving, and Arms Manufacturing. State-owned companies are reasonably common. Average income is 53,898 Caps, and evenly distributed, with the richest citizens earning only 4.0 times as much as the poorest.

An aboriginal talking stick is used for leaders' debates at election time, saying the word 'eggplant' is now a criminal offense, the arms industry is strictly regulated, and punitive tariffs protect local industry. Crime, especially youth-related, is almost non-existent. Vault 120's national animal is the Squid, which teeters on the brink of extinction due to heavy metals seepage into national waterways.

Vault 120 is ranked 106,726^th in the world and 1^st in Project Fallout for Nicest Citizens, with 14.16 average smiles per day.