§ Lothland (WR:426)
§ Lostladen (WR:435)
These are two variants for the name of the desert south of Mordor. Earlier it was called Lothlann ’wide and empty’ (TI:313).
Lothland is apparently a mere variation – both Lothland and Lothlann already appear in The Etymologies under LAD- with N. lhand, lhann ’wide’.
Lostladen is obviously again formed with l(h)ost ’empty’ (LUS-), but a different adjective l(h)aden ’open, cleared’ (LAT-). For the preservation of medial -stl- in contrast to -stl- > -thl- in Lothland, Lothlann, compare N. mistrad ’straying, error’ (MIS-), ostrad ’a street’ (RAT-).