The northern group consists of the keskmurre or central dialect that is also the basis for the standard language, the läänemurre or western dialect, roughly corresponding to Läänemaa and Pärnumaa, the saarte murre (islands') dialect of Saaremaa and Hiiumaa and the idamurre or eastern dialect on the northwestern shore of Lake Peipsi.
What is the dialect from Lake Peipsi?
the idamurre or eastern dialect