Here's one from the next edition of our dictionary of all-vowel words: Oo, a place name "never pronounced without awe and reverence," named after "a great god who dwelt under the sands of the desert"; "a wonderful place full of gold and jewels where demons dwelt," located several hundred miles down the southerly-flowing Darke River.  It is also known as "the city of unnumbered lights" and is capital of the Orbello kingdom.  Every portion of the city is subterranean except for its fortification and tower.  (The Mysterious City of Oo by Charles Lotin Hildreth, 1889.)