Linked from
The 11 pages that link to Dark-sky preserve, each with the reason it gives.
Death ValleyRelated: The park’s remote setting preserves unusually clear views of the night sky.
Bortle scaleRelated: Preserves seek the dark conditions associated with the scale’s lowest classes.
Wadi RumRelated: Low artificial lighting supports stargazing as a major activity in Wadi Rum.
Night skyRelated: Such sites retain views of faint stars and the Milky Way.