The Hypranorian Geothermal AnomalyRecent advances in the science of geology have ascribed the unusually temperate climate in the north of our continent to a colossal mantle plume; an upswell of convecting magma that drives volcanism and other geothermal activity.
The landscape is pockmarked by ancient calderas and the gentle slopes of broad shield volcanoes, most long dead or dormant but a few still periodically spewing ash and smooth flows of undulating lava. The lowlands of the calderas are characterized by boreal forests of towering redwoods, stout pines, and other conifers. Geysers and hot springs are common in these lowlands, formed as geothermal heat boils up through the water table. The volcanic highlands bear alpine tundra above the tree line, or occasionally bare igneous rock when an eruption occurs.
Thanks to the heat of the anomaly warming the earth, temperatures are more moderate than the region's latitude would suggest--but the winters are still plenty dark and cold, with the sun dipping low in sub-polar twilight for several months and blizzards coming off the ice wall to the east to envelop the country. Even in summer, ash falls can lay a dusting of volcanic cinders upon the land. The agricultural establishment gives these ash falls credit for the anomaly's high soil fertility.
Beyond to the north lies a polar ocean of increasingly distant volcanic islands and ice sheets. The harsh coast is defined by fjords and glacial flows, the greatest of which is created by the ice wall as it slowly inches toward the sea, calving icebergs the size of small islands in a single go.
Within the borders of the anomaly is a great lake fed by a confluence of many rivers flowing from snowmelt off the mountains and the great eastern ice sheet, whose steaming waters never freeze, even in the coldest of winters. Bathing in its waters, particularly in the hot springs along its shoreline, is a traditional therapy for countless illnesses from tuberculosis to gout.
"What if Iceland and Yellowstone had a baby?"
The Hypranorian Geothermal Anomaly (1): D7