The Lettosuo station (ICOS code FI-Let) is a nutrient-rich peatland forest (originally a fen-type peatland), located in southern Finland, few kilometers from highway 2. The site was drained for forestry in 1969 and partially harvested in March 2016. After drainage, the stand has developed to a mixture of Scots pine (Pinus sylvestris L.) and pubescent birch (Betula pubescens Ehrh.) in the dominant canopy layer, with an understorey of Norway spruce (Picea abies (L.) H.Karst.) with some scattered small-sized pubescent birch.
