Swamp Island

Swamp islands are structures found in quagmires. There are five different types.

Generation
Swamp island only spawn in quagmires in the Overworld. They are extremely common, and because most of quagmires are submerged, they are some of the only land above the surface of the water.

Blocks
All swamp islands consist of tall grass, grass blocks, cattails, dirt, stone, and vines. Some types also have oak logs and oak leaves, and one type has oak slabs, oak fences, and torches. The stone can be replaced with other underground materials, such as coal ore and gravel.

Lore
Quagmires were affected by rapid erosion, forming their distinctive shapes. Now most of them are flooded, with only the oddly-shaped islands sticking up above the shallow swamp waters.