Geology on Andrus is typical to all terrestrial bodies. The surface is made up of various proportions of water and land. The land has been formed over hundreds of thousands of years by plate tectonics, erosion and weathering.
The northern most mountains have been weathered and worn and now lay under perpetual glaciers and snow cover. The snow and ice feed streams and rivers flowing south across vast planes and forests growing in rich soil. These rivers empty into the southern sea that separates Upper and Lower Andrus. The western part of Upper Andrus is colder planes and plateaus. Windswept with volatile weather passing from the ocean on its way toward the eastern lands this area is less hospitable to settlements.
Lower Andrus is a much large landmass with towering young mountain chains and vast stretches of desert and tropical jungles. These lands benefit from very mild winters and suffer from long, hot summers. The south western mountain range is the newest geological formation. They are tall and jagged but bear rich deposits of various mineral resources. The south eastern mountains disrupt weather patterns often pushing life giving water out of the regions surrounding them causing significant drought and desert conditions. The north eastern coast is thick with jungle and swamp lands.
Climate patterns have evolved as land interrupts the flow of air currents over the water and the temperature variations found in various bodies of water. Disruption of the climate are caused by geologic disturbances like volcanic eruptions and large hot springs.
Upper Andrus provides a broad spread of climate zones from coastal swamps and temperate forests in the south to the deep frozen lands of the northern reaches.
Lower Andrus consists of more tropical and dry climate zones from the eastern steppes to deep tropical jungles.
Geography is the effect of climate and how it influences the use of various land forms by various cultures. Geography is wild versus cultivated, pristine versus settled.
Upper Andrus has been settled by various cultures and political borders have been established to delineate the extent of these cultures.