Halii is an inhabited planet and the homeworld of the Haliian species.
Halii is a member planet of the United Federation of Planets. (TNG episode: "Aquiel")
Tobin Dax attended a botanical conference on Halii where he heard Deilas Cyl give a presentation on light alternatives for plants. (DS9 - The Lives of Dax short story: "Sins of the Mother")