Tethus Regio
What Tethus Regio is
Tethus Regio is a regio — a large area distinguished by its brightness or colour — on Venus, centred at 66.0° N, 120.0° E.
Where the name comes from
Greek Titaness. The International Astronomical Union approved the name in 1982, under the theme it applies to every regio on Venus. Of the 19 features of this class catalogued on Venus, the naming categories run Greek (7), Norse (5), American (2), Mari (1).
What it would take to settle Tethus Regio
Venus scores 43 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 66.0° N, 120.0° 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 — same as everywhere else on this world.
Computed from Tethus Regio'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 Venus (radiation geometry, earth link). Gravity, pressure, delta-v and distance from the Sun are the same everywhere on Venus 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.
What is next to it
The largest regio features on Venus
All 19 regiones on Venus — mapped together, with the naming theme and the size distribution.