The Sea of Tranquility is a gargantuan, socially progressive nation, ruled by Michael Buzz Armstrong with an even hand, and notable for its barren, inhospitable landscape. The quiet, industrious population of 27.116 billion Tranquilityians enjoy extensive civil freedoms, particularly in social issues, while business tends to be more regulated.

The medium-sized government juggles the competing demands of Social Policy, Education, and Industry. It meets to discuss matters of state in the capital city of West Crater. The average income tax rate is 26.8%, but much higher for the wealthy.

The Tranquilityian economy, worth a remarkable 1,417 trillion MoonRocks a year, is fairly diversified and led by the Book Publishing industry, with major contributions from Woodchip Exports, Soda Sales, and Uranium Mining. Black market activity is notable. State-owned companies are common. Average income is 52,273 MoonRocks, and evenly distributed, with the richest citizens earning only 2.6 times as much as the poorest.

Elevator music has been replaced by thrash metal played at maximum volume, the mining industry is making inroads into environmentally sensitive areas, Michael Buzz Armstrong has just been declared ruler of Tranquility in an international press conference, and Lunacy has been named as Tranquility's national religion. Crime, especially youth-related, is moderate, with the police force struggling against a lack of funding and a high mortality rate. Tranquility's national animal is the eagle, which can occasionally be seen dodging aircraft in the nation's cities, and its national religion is Lunacy.

Tranquility is ranked 192,119^th in the world and 20^th in The Moon for Safest, scoring 49.7 on the Bubble-Rapp Safety Rating.