With these mountain ranges protecting the eastern and southern frontiers, the mild Atlantic winds penetrate deep inland, bringing with them all the rain and sun needed for a highly productive agriculture, while avoiding the extremes of a continental climate.
The mountain ranges are protecting the eastern and southern frontiers.
mnli hypothesis: The mountain ranges are protecting the eastern and southern frontiers. premise: With these mountain ranges protecting the eastern and southern frontiers, the mild Atlantic winds penetrate deep inland, bringing with them all the rain and sun needed for a highly productive agriculture, while avoiding the extremes of a continental climate.