The Janaran Sanctuary was a religious facility overseen by elders on the planet Betazed. This location was mentioned in Lwaxana Troi's journal.
On stardate 30622.2, in 2328, Troi wrote, "I can't believe the elders at the Janaran Sanctuary said that they've already scheduled the banquet hall on the day I'm planning my wedding. Don't they know that they're dealing with the future holder of the Sacred Chalice of Rixx?" (TNG-R: "Dark Page", okudagram)
This location was only mentioned in writing.
The Janaran Sanctuary might be associated with the Janaran Falls.