Lake Möckeln is the third largest lake in the Småland uplands for Bolmen and Åsnen and located southwest of Vaxjo, close to the border to Skåne.
Möckeln is a nutrient called brunvattensjö or Dystrophic lake with relatively low pH, naturally. Like other similar lakes in Sweden were hit Möckeln of acidification and liming takes place today regularly.
Among the fish species that occur in Möckeln are perch, pike, perch, eel, burbot, bream, roach, bream, the sheep, rudd, ruffe, bleak, whitefish and catfish. The moth is the largest freshwater fish and has Möckeln one of its four occurrences in the country (the other is Emån in Småland, Båven in Södermanland and lower Helgeån water, Kristianstad Water in Skåne). Especially in the northwest of the lake, around Agunnarydsåns outlet has ground a solid, strong trunk. The moth is a protected fish and must be released if caught. The largest catfish caught in Möckeln and documented (in 1994) weighed 52 kg. Most common fish species in the lake are pike, perch, pike, bream and roach. Particularly fishing for walleye is very popular in the lake.
The lake has an area of 48 square kilometers and is situated approximately 136 meters above sea level. Maximum depth is 12 meters. The length is about 16 kilometers from north to south. Breadth in northern parts are nearly 7 kilometers, but the southern and middle parts are narrower by about 1 to 1.5 kilometers.
Three tributaries are, the greater Helge River which empties into Möckeln at Dio in the Northeast, and the two smaller Little River Helge and Agunnarydsån which flows into the lake in the far north-east and north-west. The outlet of the lake is at the properties Älvanäs and Byvärma in the northwest, where Helgeån then continues south towards Hanöbukten in eastern Skåne. A former outlet was before sjösänkningen in the southern part of the lake. This outlet south Möckeln joints with drift through the now lower lakes in Älmhult and Ormakulla. The water flow south exaggerated now vanished mills in the villages Slätthult Kong and Torp. The lake level and municipal land development in the 1900s, this contemporary outlet nowadays, on the contrary turned into an occasional stagnant surface water inflow to Möckeln.
The water level may vary about 1 meter up or down over the Mediterranean waterline (137-135 meters above sea level) depending on rainfall and runoff, but the lake is not regulated.
The fishing area includes Möckeln, stoning, Saw Nässjön and part of Little River Helge. The lakes are in Älmhult Ljungby and municipalities in southwestern Småland, Kronoberg County, just north of Älmhult.