In Latvian mythology, Austras Koks ("tree of the east" or "tree of the dawn") was a tree that grew from the start of Saules' (the sun's) daily journey across the sky. It is usually considered an oak.

Austras Koks had silver leaves, copper roots and gold branches and is located on the shores of the Daugava River (Kurzeme), Vidzeme or Latgale.