The name of the great eastern forest before it became Mirkwood, translated “Greenwood” (UT/281). This name is a combination of eryn “woods” and the lenited form galen of calen “green”. With its restoration after the War of the Ring, Mirkwood was renamed to Eryn Lasgalen “Wood of Greenleaves”.
Sindarin
Eryn Galen
noun. green forest
eryn galen
place name. Greenwood
eryn (“wood”), calen (“green”)