Nan Elmoth
From Tolkien Gateway
Nan Elmoth was the forest in Beleriand east of Doriath and south of the River Celon.
Melian enchanted Thingol in Nan Elmoth, before they founded the realm of Doriath. Later the trees grew to be the tallest and darkest in Beleriand, blocking the sun entirely from the forest floor, and Eöl the Dark Elf dwelt there. Nan Elmoth was held to be part of Doriath, and Eöl paid Thingol with the black sword Gurthang as a fee for living there.
