A henge was essentially a circular monument constructed from numerous upright stones. One such henge existed on the planet Peridea, a world that was once part of the ancient Witch Kingdom of the Dathmiri. After journeying from their home galaxy to another, the Dathomiri erected a separate henge on the planet Seatos long before 9 ABY. This second henge was built to help them pinpoint their original home while traversing the intergalactic void. Functioning as a reflex point through the use of magick, the Seatos henge worked together with a star map concealed by the Dathomiri Nightsisters on the planet Arcana, which together revealed the Pathway to Peridea.
Within the Ahsoka show, the stone circles found on both Seatos and Peridea are called henges. In our world, a henge refers to a circular area surrounded by an earthen bank and a ditch, which first appeared in the British Isles during the Neolithic period. The oldest known henge, which dates back to approximately 3000 BC, is located on the Orkney Islands. Although henges are not stone circles themselves, these two kinds of Neolithic structures are sometimes found in the same location.