Peat swamp forests are forest wetlands in tropical and subtropical areas. They have poor drainage. Waterlogged soil prevents dead leaves and wood from decomposing fully. Over time, this creates a thick layer of acidic peat. They are made up of trees which are broadleaved (not conifers), and many other types of flowering plants.
Peat swamp forests are usually surrounded by lowland rain forests on better-drained soils. There may be brackish or salt-water mangrove forests near the coast.
These tropical swamp forests are quite different from the north temperate peat bogs in climates such as in Ireland. Temperate peat bogs are not caused by forests, but mostly by mosses such as Sphagnum, grasses, sedges and shrubs.