The Sim
The Erehwon Region is a boreal region situated in the Northern Hemisphere of the Pokémon World, and the setting of "Kids & Monsters." The region itself can be divided into three major landmasses; a large "boomerang" that comprises the majority of the region; a peninsula that borders the Kalos Region to the South; and a small island situated to the Northwest.
While a majority of the Erehwon region is characterized by its high elevation and a lack of foliage—especially in the Northern and Eastern area of the region—a significant portion of the Southern Estuary and Western Coast of the Boomerang of Erehwon are lush in vegetation and thus breed their own unique ecosystems of Pokémon. The Northwest Island is especially fertile thanks to volcanic activity resulting from its location along a major fault line.
The history of the Erehwon region can be traced as far back as 1500 BCE, when a group of ancient Kalosians first ventured over what is now known as the Laverre Mountain Range and settled in the Southern Peninsula of Erehwon. Evidence suggests that they became aware of a much larger land mass situated Northeast of the Peninsula not long after first settling in the region, but it was not until about 1400 BCE when the first explorers began venturing into the southernmost areas of the Boomerang. Early colonization efforts were largely unsuccessful due to the settlers being unaccustomed to the harsh winter climate that pervaded the Erehwon Region for the most of the year. Most either starved to death or returned to the Peninsula within a year.
However, their fortunes are said to have changed when an ill-fated expedition to chart the Boomerang was shipwrecked during a severe winter storm. With no prospect of returning to the peninsula, the explorers had all but consigned themselves to their inevitable demise when a large blue bird—referred to in ancient texts as the "Noreinn", or "Northern One"—appeared before them and guided them towards a tract of land along the Western Coast that was sheltered from the harsh winter weather. Out of gratitude for saving their lives, the explorers erected a shrine honoring the Noreinn, from which would grow a small colony, then a village, then a castle, and finally what is now known as the modern-day city of Osvolund.