Deildedalen Valley (71°24′S 12°43′E) is a small valley partly filled with ice and opening to the north, lying between Mount Deildenapen and a similar mountain mass just westward in the Östliche Petermann Range, Wohlthat Mountains, Queen Maud Land. It was discovered and plotted from air photos by the Third German Antarctic Expedition, 1938–39. It was replotted from air photos and surveys by the Sixth Norwegian Antarctic Expedition, 1956–60, and named Deildedalen (the dividing valley).
"Deilde" is also an old name for a border mark or border stone in Norwegian.
References
Deildedalen Valley Wikipedia(Text) CC BY-SA