This is the 735th most frequent Icelandic word.
austan
The Icelandic word "austan" means "from the east" in English.
Here, 'austan' is used as an adverb indicating the direction the wind is coming from, specifically from the east.
Það blés blítt austan á landið.
A gentle breeze blew from the east towards the land.
In this sentence, 'austan' describes the location relative to the mountain, meaning the east side of it.
Við gengum austan við fjallið.
We walked on the eastern side of the mountain.
Here, 'austan' is used adverbially to denote the direction or placement in relation to a reference point, in this case, where the nest is located.