File — Brytonia

1. Where it is

51° to 58° N, an archipelago to the west, separated from the continent by the Insular Channel — 150 km at its narrowest.

The two facts of position that decide everything:

1. The warm Insular Current bathes the whole archipelago. The same latitude as Königsmark, thirteen degrees more in January (The nine wounds).
2. It is an island. A hundred and fifty kilometres of water that no demonic army has crossed in a hundred and ten years — and Seal VI, the last to break, broke in the Highlands with six years of warning and less than twelve months of exposure.

Brytonia never suffered a land invasion and never owed its life to Rome. Everything else in this file and all insular politics derive from that sentence.

2. Relief

Unit	Altitude	Characteristic
UnitSouthern plains	Altitude0-150 m	Characteristicdeep soil, good drainage, agriculture at scale
UnitIndustrial basin	Altitude0-300 m	Characteristiccoal in a shallow seam — extractable with pre-industrial technology
UnitHighlands of Caer'n	Altitude300-1,200 m	Characteristicheather, deep loch, granite. Seal VI
UnitMoors	Altitude100-400 m	Characteristicpeat, gorse, open landscape
UnitCoast	Altitudeindented	Characteristicdeep navigable estuaries — natural ports all the way round

3. Climate — figures

January mean	+4 °C
July mean	+17 °C — an amplitude of only 13 degrees, the smallest on the continent
Precipitation	1,400 mm, spread over 190 days of rain
Growing season	210 days
Frost days	~25
Characteristic	it never freezes in earnest and never dries out

Fog: humid oceanic air over a colder surface. An average of 60 days a year of fog in Brithon before industrialisation; more than 100 after 1850.