Arabia Mountain in the first twenty minutes

Most high places are worth climbing for what you can see from the top. This one is worth walking up for what is under your boots.

Arabia Mountain is not a mountain. It is a granite outcrop east of Atlanta, a low bare dome of rock pushed up and then scraped clean, with a summit you reach by walking uphill across open stone for twenty minutes. Quarrying took bites out of it for decades and then stopped, and now it is a protected area with a trail across it marked by cairns and paint.

The reason to be there at seven is that the surface of the rock is textured, and texture only exists in light that crosses it. Once the sun is high the whole dome goes flat and grey and there is nothing to look at.

What is actually on the rock

The surface is not bare. It is covered in a thin, slow, easily wrecked ecosystem that exists almost nowhere else.

Rain collects in shallow depressions in the granite, a few inches deep at most. Grit accumulates. Something grows in the grit. The result is a set of round pools scattered across the dome, each with a rim of lichen, a ring of moss and a centre of low plants, and in early spring the centre of many of them turns deep red.

The red is a small succulent that grows in these pools and nearly nowhere else. It is red for a few weeks in late winter and early spring, then it flowers white, then it is gone. Standing on the dome in the third week of March, you get pools of red set into grey rock with the sun raking across from the side, and there is nothing else in the region that looks remotely like it.

The pools are perhaps three inches deep and they took a very long time to fill. A boot print in one is the work of an afternoon and the loss of a decade.

Walk around them. Never through. This is written on every sign at the trailhead and it is worth repeating because the pools are easy to miss in the dark and the rock is easy to walk fast on.

The light

The dome tilts, and the trail crosses it at an angle, so at seven the sun comes in low and sideways across the whole surface. Every ripple in the granite, every quarry scar, every seam of darker rock throws a shadow the length of itself. The pools catch the light in their water and the red goes luminous.

By twenty past eight it is over. Not gone, but flattened. By nine the rock is a grey field, the pools are dull, and the interest has moved to the long view off the edge, which is pleasant and unremarkable.

There is no shade anywhere. In March that is fine. In July it means being off the rock by half past eight, and it means carrying water for a walk that looks far too short to need it.

Getting up it

The trail is a mile and a half round from the nearest parking area, on rock the whole way. It is not steep and it is not technical. What it is, is featureless in the dark: cairns and paint marks on bare stone, and very little else to steer by.

Going up in full dark with a torch is possible and is easy to get wrong, because a torch beam on grey rock washes out the paint marks and the cairns cast confusing shadows. The better approach is to arrive at first light, when there is enough general light to see the line of the trail and still an hour of good sun angle ahead.

Wet granite is slick, particularly where lichen grows on it. After rain the whole dome is greasy.

The other reason to be there early

Sound. A bare rock dome with no trees on it, at seven in the morning, in a metro area of six million people, is silent in a way that is genuinely strange. You can hear a distant road and nothing else, and the absence of leaf noise makes it feel emptier than a forest ever does.

That lasts until the first other walkers appear, which is usually around half past eight at a weekend and later on a weekday.

Was it worth the alarm

In the third week of March, this is the best early morning within an hour of Atlanta, and it is not close.

The rest of the year it is a good walk with an interesting surface and a modest view. The window when the pools are red is short, it moves a week or two either way depending on the winter, and missing it means waiting a year. That makes it the one morning in this file worth watching a calendar for.