Their earliest tales seem to glimpse a time when they dwelt in the upper vales of Anduin, between the eaves of NAME_1 and the Misty Mountains. Why they later undertook the hard and perilous crossing of the mountains into Eriador is no longer certain. Their own accounts speak of the multiplying of Men in the land, and of a shadow that fell on the forest, so that it became darkened and its new name was Mirkwood.

What does eaves mean in this context? Provide your response in exactly 4 paragraphs (separated nearby paragraphs with 3 aterisk symbols ***).
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