The Watcher in the Water is a fictional creature in J. R. R. Tolkien's Middle-earth; it appears in The Fellowship of the Ring, the first volume of The Lord of the Rings. Lurking in a lake beneath the western walls of the dwarf-realm Moria, it is said to have appeared after the damming of the river Sirannon, and its presence was first recorded by Balin's dwarf company 30 or so years before the beginning of The Fellowship of the Ring.
Book illustration by John Howe
Gateway to Hell: the Fellowship's passage past the Watcher in the Water and through Moria's Doors of Durin has been compared to Odysseus's passage between the devouring Scylla and the whirlpool Charybdis. Painting by Ary Renan, 1894
In the fictional world of J. R. R. Tolkien, Moria, also named Khazad-dûm, is an ancient subterranean complex in Middle-earth, comprising a vast labyrinthine network of tunnels, chambers, mines and halls under the Misty Mountains, with doors on both the western and the eastern sides of the mountain range. Moria is introduced in Tolkien's novel The Hobbit, and is a major scene of action in The Lord of the Rings.
Mist on the Alps: Tolkien's experiences on his 1911 visit gave him the idea for difficulties crossing the Misty Mountains.
The Fellowship of the Ring in Moria. Scraperboard illustration by Alexander Korotich, 1981
Tolkien's illustration of the Doors of Durin, with Sindarin inscription in Tengwar script.
Tolkien visited the temple of Nodens at a place called "Dwarf's Hill" and translated an inscription with a curse upon a ring. It may have inspired his dwarves, mines, rings, and Celebrimbor "Silver-Hand", an Elven-smith who contributed to Moria's building.