Ourea

In Greek mythology, the Ourea (Ancient Greek: Οὔρεα, romanized: Oúrea, lit. 'mountains', plural of [Οὖρος] Error: {{Lang}}: invalid parameter: |3= (help), or 'Oûros') were the parthenogenetic offspring of Gaia (Earth), produced alongside Uranus (Sky), and Pontus (Sea).^[1]

According to Hesiod:

And [Gaia] brought forth long hills [Οὔρεα], graceful haunts
of the goddess Nymphs who dwell amongst the glens of the hills.^[2]

Defined by Middle Liddell as from οὖρος "mountain, hill; mule; a guard."^[3]

Notes

Apollonius Rhodius, Argonautica translated by Robert Cooper Seaton (1853–1915), R. C. Loeb Classical Library Volume 001. London, William Heinemann Ltd, 1912. Online version at the Topos Text Project.
Caldwell, Richard, Hesiod's Theogony, Focus Publishing/R. Pullins Company (June 1, 1987). ISBN 978-0-941051-00-2. Internet Archive.
Fitz Simon, James A., Vincent Alphonso Fitz Simon, The Gods of Old: and The Story That They Tell, T. Fisher Unwin, 1899. p. 27
Gantz, Timothy, Early Greek Myth: A Guide to Literary and Artistic Sources, Johns Hopkins University Press, 1996, Two volumes: ISBN 978-0-8018-5360-9 (Vol. 1), ISBN 978-0-8018-5362-3 (Vol. 2).
Hard, Robin, Herbert Jennings Rose, The Routledge Handbook of Greek Mythology: Based on H.J. Rose's "Handbook of Greek mythology", Routledge, 2004. ISBN 978-0-415-18636-0. p. 24
Hesiod, Theogony from The Homeric Hymns and Homerica with an English Translation by Hugh G. Evelyn-White, Cambridge, MA., Harvard University Press; London, William Heinemann Ltd. 1914. Online version at the Perseus Digital Library. Greek text available from the same website.
Littleton, Scott and the Marshall Cavendish Corporation Gods, Goddesses, and Mythology, Volume 1. Marshall Cavendish, 2005. ISBN 978-0-7614-7559-0. pp. 1020, 1134
http://www.perseus.tufts.edu/hopper/morph?l=ou%29%2Frea&la=greek&can=ou%29%2Frea0&prior=o)/ros#Perseus:text:1999.04.0058:entry=o)/ros-contents