Nedre Blomsjön is the largest lake held by Blomskogs FVO. The lake is situated between Lennartsfors and Arjang. A good boat ramp can be found in the southern part of the lake.
Nedre Blomsjön is the largest lake within Blomskogs FVO, it has a maximum depth of almost 40 meters. The shores are mostly steep, and around the lake you find a typical forest and wilderness character. Streams entering the lake come mostly from Övre Blomsjön, and some creeks and streams flow out into Blomälven, situated in the lake's southern part. There are about 40 lakes, included the smaller lakes in the forests, in Blomskogs FVO.