Noirinan was a valley on the southern slopes of the mountain Meneltarma.
Within the rock of the mountain was a head chamber where the bygone Kings and Queens of Númenor were entombed. 
Here was located a spring from the Siril river where Aragorn first met Gandalf.
Noirinan was a Quenyan word that meant "Valley of the tombs". It came from the words noirë, meaning 'tomb', and nan, meaning 'valley'.
- ↑ 1.0 1.1 The Atlas of Middle-earth, The Second Age, "Númenor"
- ↑ Unfinished Tales, Part Two: The Second Age, I: "A Description of the Island of Númenor"