Question: What is the name of a protected area located in the Adelaide Hills, South Australia which conserves a significant area of natural bushland and which forms a boundary to the east of Waterfall Gully near the foothills of the Mount Lofty Ranges?
Sentence (from "Waterfall Gully, South Australia"): At the southern end of the gully is First Falls, the waterfall for which the suburb was named.
Relevant evidence: No