Friso-Saxon (Dutch: friso-saksische tongvallen,[1] friso-saksisch) is a group of West Germanic dialects found around the North Sea coast of the Netherlands and Germany, in an area historically known as Frisia.
[2][3] They are dialects of Low German/Low Saxon that have experienced strong influence from a Frisian language.
The term was established by the Dutch researcher Johan Winkler in his work about Dutch, Low German and Frisian dialects in the region.
[3] The Friso-Saxon dialects are spoken in areas which were historically Frisian-speaking, until Frisian was gradually replaced with Low Saxon beginning in the Late Middle Ages.
The only exception to this rule is Stellingwarfs, a Low Saxon dialect which has undergone influence especially from West Frisian.