Uphill Island

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

Principles
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.

Background
Uphill Island was originally just a small rock about 3m across, but due to a submarine volcanic eruption about 50 years prior to the story's first year, 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.

Toaru Majutsu no Index SS: Kanzaki
Ymir's Ocean Girl came to Uphill Island to research the impacts of Christianity on other religions. As she didn't expect anyone else to come, she neglected using people-clearing magic and used her magic to control the water currents to prevent the sea from eroding the rock. This led to her being seen controlling the water, resulting in the precarious balance between Uphill Island and the surrounding islands being skewed. Fearing that the locals might be slaughtered if she left, the girl remained on the island.