About 62% of the world’s tropical peat lands occur in southeast Asia. In this area 80% is in Indonesia, 11% in Malaysia, 6% in Papua New Guinea, with pockets in Brunei, Vietnam, the Philippines, and Thailand. They have trees up to 70 m high. The spongy, unstable, waterlogged, anaerobic beds of peat can be up to 20 m deep with low pH (pH 2.9 – 4) and low nutrients. The forest floor is seasonally flooded. The water is stained dark brown by the tannins that leach from the fallen leaves and peat – hence the name ‘blackwater swamps’. During the dry season, the peat remains waterlogged and pools lie among the trees.