Sinkhole risk in McIntosh County, GA: Mostly deep or small

Mostly deep or small

Some soluble rock, mostly deeply buried or in a small share of the county.

On soluble rock: 7%
At or near the surface: 0%
Buried under cover: 7%

What this means before you buy

Sinkholes are uncommon here; watch for new depressions after heavy rain or leaking pipes.

That works out to roughly 30 of McIntosh County's 431 square miles on soluble rock. With about 11,800 residents (27 per square mile), much of the land is open, and the mapped rock may sit far from where people actually live. The figures come from 242 map points about 1.3 miles apart, so a pocket smaller than that can be missed or overstated.

Worth reading for this county: why the 7% under cover still counts, and how these percentages are measured.

Counties around McIntosh County

The nearest county rated sinkhole country is Nassau County, FL, about 65 miles south. 3 of the 6 closest counties land in the same band; the ground changes quickly around here.

Glynn County, GA 20 mi south · 0% at surface
Liberty County, GA 23 mi north · 0% at surface
Long County, GA 28 mi northwest · 0% at surface
Wayne County, GA 32 mi west · 0% at surface
Bryan County, GA 37 mi north · under 1% at surface
Chatham County, GA 38 mi northeast · 0% at surface

Which formation it is

The largest mapped soluble unit here is the Charlton Formation and Duplin Marl (limestone), Pliocene in age, covering about 7% of the county.

Against the rest of Georgia

McIntosh County ranks 122 of 159 in Georgia for soluble rock at the surface, and sits above 0% of US counties on that measure.