Peneus Palus
What Peneus Palus is
Peneus Palus is a palus — a small dark plain — on Mars, 870 km across, centred at 35.1° S, 56.7° E in the Noachis quadrangle. It is the 104th largest named feature on Mars and the 1st largest of its class there.
Where the name comes from
From classical albedo feature at 48S, 290W. The International Astronomical Union approved the name in 2015, under the theme it applies to every palus on Mars. Of the 6 features of this class catalogued on Mars, the naming categories run Greek (3), Latin (2), India (1).
What it would take to settle Peneus Palus
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 35.1° S, 56.7° E.
What this spot has going for it is ground — flat ground — the easiest thing to land on and build across. What works against it is water — outside the ice-bearing latitudes.
Computed from Peneus Palus'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.