Phlegra
What Phlegra is
Phlegra is an albedo feature — a region named for how bright or dark it appears from a distance — on Mars, 134 km across, centred at 30.0° N, 170.0° E in the Elysium quadrangle. It is the 519th largest named feature on Mars and the 1st largest of its class there.
Where the name comes from
"Burning plain;" in Chalcidian Peninsula of Greece where Zeus hurled thunderbolts at Titans to support Hercules. The International Astronomical Union approved the name in 1958.
What it would take to settle Phlegra
Mars scores 26.6 as a world. That number is the same for every square metre of it — but sunlight, water, radiation and the ground under your feet are not. This is the same question asked at 30.0° N, 170.0° E.
What this spot has going for it is sunlight — 88% of the sunlight the sunniest latitude on Mars gets. What works against it is water — outside the ice-bearing latitudes.
Computed from Phlegra's catalogued latitude, longitude and feature class — 74% of the model's weight had a basis here, and 2 axes were dropped as not applicable to Mars (radiation geometry, earth link). Gravity, pressure, delta-v and distance from the Sun are the same everywhere on Mars and are already counted in the world's own index, not again here.
What this cannot see: elevation. Slope, local shadowing and the polar “peaks of eternal light” — ridge tops near the poles of a barely tilted world that catch sun almost continuously while a crater floor kilometres away never does — need a terrain model this does not have. Where a real mission targets a pole, that is usually why.