Project

See Seven States

Lover’s Leap, Rock City Gardens, Georgia · 34.972° N, 85.350° W · 520 m · USGS 3DEP 90 m DEM

Rock City is a legendary piece of Americana in the Deep South. Nestled in Tennessee’s famous Lookout mountain — although technically just over the border in Georgia — is a lovely series of trails and bridges and caves and crevices and cliffs with a slightly surreal black-light gnome theme.

I visited as a child, and I’ve visited as an adult. The sense of wonder is differently flavored at different ages, but the experience has always been memorable and delightful. The famous signs and painted barn roofs and birdhouses shouting “See Rock City” may be advertising, but it’s honest advertising. Rock City is well worth seeing.

The Lover’s Leap overlook at Rock City: a rock promontory topped by a stone observation deck flying seven state flags, jutting from a limestone cliff face above a wooded valley.
Lover’s Leap seen from the observation deck at Rock City Gardens, with the seven state flags flying above it. Photograph by Asdaiang14453, November 2024, CC BY 4.0.

One of the most famous spots in the attraction is Lover’s Leap, a beautiful clifftop view from which one can See Seven States.

The See Seven States plaque atop Lover’s Leap: a stone marker painted with black arrows fanning out toward each claimed state, lettered Tenn. ½ mi., Mt. Pinnacle Ky.-Va. 120 mi., Smoky Mts. N.C. 50 mi., S.C. 80 mi., Georgia, and Ala. 25 mi., overlooking a forested valley.
The “See Seven States” plaque atop Lover’s Leap. Its arrows carry the legend’s own distances: Tenn. ½ mi. · Mt. Pinnacle Ky.-Va. 120 mi. · Smoky Mts. N.C. 50 mi. · S.C. 80 mi. · Georgia · Ala. 25 mi. Photograph by Asdaiang14453, November 2024, CC BY 4.0.

Can you see seven states? Georgia is straightforwardly visible; Lover’s Leap is in Georgia. Tennessee is visible, and in fact within a few minutes’ walking distance. Alabama is close. It’s twenty-five miles according to the plaque at the cliff edge, which is in principle not a heavy lift from a high cliff.

Kentucky? Virginia? North and South Carolina? Hmm.

When I was a kid, looking into the distance from Lover’s Leap, I wondered which areas corresponded to which state. Was that Virginia in the distance?

Now that I’m an adult, I know about things like the United States Geological Survey and their 90 m resolution grid of elevation data. In principle, it’s easy to draw a line from the elevation grid point located at Lover’s Leap to the surrounding grid points throughout the southern United States. If that line is not blocked by a nearer grid square, the end point is indeed within your viewshed. You do have to account for the curvature of the earth. You should also account for the slightly variable atmospheric refraction, but in this case the effect is minimal enough so as to make no difference.

The result? I am sorry to say that you can see three states from Lover’s Leap: Georgia, Tennessee, and if haze allows, North Carolina.

Viewshed map centered on Lover’s Leap, 280 km radius. Blue marks terrain visible from the observer: long streaks along the Tennessee River valley immediately north and east, and small scattered patches reaching into the North Carolina mountains. Georgia, Tennessee and North Carolina are outlined in black as visible; Alabama, South Carolina, Kentucky and Virginia are grayed out.
Terrain visible from Lover’s Leap, out to the 280 km analysis cutoff. Blue cells are visible; the rings mark 50 km intervals. Visible states are outlined and labeled in black, the four claimed-but-blocked states in gray. The sight lines run east-northeast, threading down the Tennessee River valley and out to the western edge of the southern Appalachians; the view west and south is cut off almost immediately by the rest of the Lookout Mountain plateau. — Claude

Alabama is indeed very nearby, but the entire state is blocked from view by Lookout Mountain itself. South Carolina is blocked by the higher elevations of North Carolina and Georgia. Kentucky is blocked largely by the more northerly segments of the mountain range you’re standing on. Virginia is mostly geometrically intractable simply because the Earth is round.

Alas, the See Seven States legend is indeed a legend.

But the South is a place of mystery, of moonshine, of mountains that are older than the trees. If you look carefully enough, you can see the soul of those seven states. At Rock City, that magic more than suffices.

The tables and notes below are machine-generated.

Per-state results

statevisiblenearest visible farthest visiblehighest visible
Tennesseeyes1.3 km170 km1,642 m
Georgiayes0 km111 km1,255 m
North Carolinayes97 km149 km1,688 m
Alabamano
South Carolinano
Kentuckyno
Virginiano

Distances are from the observer; the observer stands in Georgia, so its nearest visible cell is the ground underfoot. The highest visible cell in Tennessee (1,642 m) is in the Cherokee National Forest, in Georgia (1,255 m) the Cohutta Wilderness, and in North Carolina (1,688 m) the Nantahala National Forest.

Sensitivity

Visible cells per state, across the refraction coefficient k and observer eye height h. The set of visible states does not change in any scenario: strong refraction roughly doubles the North Carolina count, and a 30 m eye height — about a ten-story building — does not lift Alabama, South Carolina, Kentucky or Virginia above zero.

scenarioTNGANC ALSCKYVA
Standard (k = 1/7, h = 2 m)48,72854,2576460000
No refraction (k = 0, h = 2 m)44,06252,2124030000
Strong inversion (k = 0.25, h = 2 m)53,02055,8041,0070000
Generous height (k = 1/7, h = 30 m)54,67860,2277450000

The data files

filecontents
state_results.json Per state: visible yes/no, cell counts, and the nearest, farthest and highest visible cell (latitude, longitude, distance, elevation, bearing).
sensitivity.json Visible-cell counts per state for each of the four scenarios in the table above.