Large island was formed on high point in a ridge?

A large island formed on a high point in a ridge typically occurs due to geological processes such as volcanic activity or tectonic uplift. As magma rises to the surface, it can create an island if it breaches the ocean's surface. Alternatively, if a ridge emerges above sea level due to tectonic forces, it can create an island environment. These islands often have unique ecosystems and geological features due to their isolated nature.