Small island

A small island (aka. end island) is roughly a hemispherical cluster of end stone blocks found within its respective biome.

Generation
Small islands are generated from Y=55 to Y=70 around outer islands. The probability that a small island tries to generate in each chunk is $1/14$. It generates successfully when in biome or at a chunk where the noise value fits. $$, if it tries generate a small island in a chunk, there's an $1/4$ probability to try to generate another small island in this chunk. The two islands often overlap with each other.$$, if the the chunk's noise value fits, there's also a probability of $1/4$ to re-generate another island, but at the exactly same position, which makes the two islands look like a sinlge island.

It also generates when an end gateway spawns on the outer island if the chunk does not provide any End stone.

ID