Dellah was a resource-poor planet on the fringes of Earth Empire space. It was home to St Oscar's University in the late 26th century. Bernice Summerfield lived on Dellah for several years in the 2590s. The planet was near Urtilaxian.
Dellah was mostly covered by temperate oceans and dotted with islands. Its largest body of water, the Silvasic Sea, took up most of the temperate zone (between 23.5°S and 66.5°S) in Dellah's southern hemisphere. (PROSE: Dry Pilgrimage) A day on Dellah was 26 hours long. (PROSE: Mean Streets)
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- The Marek Dha landmass and an associated island chain, called the Marek Dha islands. These islands, many of them private, were dotted with luxurious homes for the very very wealthy, such as industrialist Marcus Krytell. (PROSE: Ship of Fools)
- Chain of several hilly islands in the northern hemisphere, home to St Oscar's University and Dellah's only spaceport. (PROSE: Oh No It Isn't!)
In 2595, the All-High Gods took over Dellah, driving the inhabitants into a religious fury. Some inhabitants escaped to such planets as Thanaxos. (PROSE: The Mary-Sue Extrusion) Dellah was lost in an alternative dimension, which had been the origins of the All-High Gods, proven to be the dimension of the Ferutu. (PROSE: Twilight of the Gods)