Uphill Island

Uphill Island (アップヒル島) is a small island located in Micronesia.

Details
Uphill Island covers about 17 km and is roughly 2km across from north to south.

Due to the discrimination that they have received from the residents of the surrounding islands, residents of Uphill Island are very wary of outsiders, and a teaching that those on the island are good while outsiders are bad has been spreading.

History
Uphill Island was originally just a small rock about 3m across, but due to a submarine volcanic eruption about 50 years prior to the current year of the story timeline, the earth's crust swelled, causing the island to grow rapidly.

Due to the irregular way the island emerged, it gave residents of the surrounding islands a negative impression, leading to the residents of Uphill Island being subject to discrimination.