The Fleet Of Stars,
5.
Eos is a small Martian town at one edge of Margaritifer Sinus and on:
"...the rim of Eos Chasma, near the eastern end of Valles Marineris." (p. 53)
On the Sinus, visible from Eos and beyond the area cultivated with metamorphic species, there are boulders, dunes, craters, basaltic upthrusts, wind-driven dust, a receding road and a remote gleaming laser pylon.
Below Eos, cliffs and crags descend until the land rises again before toppling into Capri Chasma three hundred kilometers away. The Valles stretches to the west. The area is rich in minerals generated when Mars had had volcanoes, running water and a thicker atmosphere.
Whereas Lunar dwellings are either domed or excavated, the radiation-proof, airtight and biointegrated Martian dwellings stand otherwise unprotected on the surface.
Originally, Martian colonists had sold goods, chemicals, food and biological products to asteroidal workers although that trade no longer exists.
Mars is a Republic although its two species organize separately. David and Helen Ronay own a plantation and estate at Sananton near Eos and David is a regional deputy to the House of Ethnoi.
A Lunarian clandom lives in Capri Chasma where, instead of streets, the cliff-top town of Belgarre has a mosaic pavement between widely separated buildings topped by solar collectors and displaying emblems of phyle and phratry.
David's and Helen's daughter, Kinna, befriends Elverir of the Nantai etaine.