Earth

Earth (地球, Chikyū) is the planet on which most of One-Punch Man takes place. Although the planet largely resembles the real-world Earth, it possesses some distinctive differences.

Description
The Earth, unlike its real-world counterpart, possesses a single super-continent instead of multiple large landmasses. The continent has 26 cities, each identified by a letter of the modern English alphabet.

In addition to the supercontinent covering most of the planet, it possesses smaller islands and landmasses that lie in its immense ocean.

The "seven faced islands" contain potatoes.

In the anime, Earth was shown to have four natural satellites instead of a single moon.

The reason why the Earth is so radically different from its real-world counterpart is that it underwent two major "eras of change." The first era of change was when all the languages were united and a world government was established in response to the constant wars that threatened humanity's survival. The second was when the resulting climate change from these wars made most of the planet uninhabitable, forcing humanity to migrate to the supercontinent.

Inhabitants
Humans are the dominant species of Earth. The planet is also home to multiple species of plants and animals. Unclassified creatures are grouped into a category of beings called Mysterious Beings. This category also includes non-human races, such as the Subterranean People, the Skyfolk, the Seafolk, and the Terror Lizard Clan.

Earth's second era of change lead to many dangerous life forms being born across the other landmasses. According to Sweet Mask, the majority of Mysterious Beings originate from humans.

Locations
Cities=

Places=

Trivia

 * The shape of the planet's supercontinent is the same as the Saitama Prefecture in Japan. This is the prefecture that One-Punch Man author ONE was brought up in.
 * The currency of the world is nearly identical to the real-world Japanese yen. The 10,000 yen note (the only banknote shown in the series) features the face of a ball-chinned man (possibly an ancestor of Agoni and the Ball-Chinned Kid) instead of Fukuzawa Yukichi.