Review of previous ecological and socioeconomic studies performed in the drainage basin of Lake Engure - the long-term socioecological research region (LT(S)ER) of the National LTER network of Latvia has been given. A number of studies on biodiversity and ecosystem structure of the region were published during the last century. There have been no special socioeconomic studies of the region till now. The data should be collected mostly from different archives and statistical summaries. Biodiversity of the region has been formed over the centuries and is strongly dependent on socioeconomic factors.