Places in Middle-earth
Hithlum
Type: Kingdoms, Realms, Lands
Region: Beleriand & North
Meaning: Mist Shadow
Other Names Hísilómë, Land of Mist
Location: "In the west it was bounded by Ered Lómin, the Echoing Mountains that marched near the sea; and in the east and south by the great curve of Ered Wethrin, the Shadowy Mountains, that looked across Ard-galen and the Vale of Sirion."
The Silmarillion, Ch 14, Of Beleriand and Its Realms
From the Silmarillion map it appears that Hithlum is not part of Beleriand, but rather of the Lands to the North. It is placed at approximately the same latitude as Thangorodrim.
Description: "It was a fair land while the Siege of Angband lasted, although its air was cool and winter there was cold."
The Silmarillion, Ch 14, Of Beleriand and Its Realms
Hithlum was held by Fingolfin and Fingon. After Nirnaeth Arnoediad, the Battle of Unnumbered Tears, Morgoth gave the land to the Easterlings.
Etymology
hith 'mist' in Hithaeglir, Hithlum (also in Nen Hithoel, a lake in Anduin). Hithlum is Sindarin in form, adapted from the Quenya name Hísilómë given by the Noldorin exiles (Quenya hísië 'mist', cf. Hísimë, the name of the eleventh month of the year. The Lord of the Rings Appendix D).
The Silmarillion, Appendix: Elements in Quenya and Sindarin Names
Contributors: Lyllyn 1.03.04
added Etymology: Elena Tiriel 5Jan05