Hellhole Falls is a single-tier 25-foot waterfall located on Wildcat Creek between Lower Wildcat Falls and Upper Wildcat Falls. It lies in a small, deep gorge just below the confluence with Hellhole Branch. Unlike the other two waterfalls, this one is much harder to reach. Despite being fairly close to Wildcat Road (FR 26-1), there is no trail down to Hellhole Falls. It requires a rugged, overgrown bushwhack to approach. 

Additionally, a large cascade lies a few hundred feet downstream along Wildcat Creek below Hellhole Falls. I've seen it called St. Paddy's Falls. See photo below. 

For detailed directions, see page 286 in Mark Ozboyd's "Waterfalls of Georgia" guidebook.