East Frisian language in the context of East Frisian Low Saxon language

The Frisian languages (/ˈfriːʒən/ FREE-zhən or /ˈfrɪziən/ FRIZ-ee-ən) are a closely related group of West Germanic languages, spoken by about 400,000 Frisian people, who live on the southern fringes of the North Sea in the Netherlands and Germany. The Frisian languages are the closest living language group to the Anglic languages; the two groups make up the Anglo-Frisian languages group and together with the Low German dialects these form the North Sea Germanic languages. Despite the close genetic relationship between English and Frisian, the modern languages are not mutually intelligible. Geographical and historical circumstances have caused the two languages to drift apart linguistically.

Frisian is traditionally divided into three branches often labeled distinct Frisian languages even though the dialects within each branch are not necessarily mutually intelligible. West Frisian is by far the most spoken of the three and is an official language in the Dutch province of Friesland, where it is spoken on the mainland and on two of the West Frisian Islands: Terschelling and Schiermonnikoog. It is also spoken in four villages in the Westerkwartier of the neighbouring province of Groningen. North Frisian, the second branch, is spoken in the northernmost German district of Nordfriesland in the state of Schleswig-Holstein, on the North Frisian mainland and on the North Frisian Islands of Sylt, Föhr, Amrum, and the Halligs. It is also spoken on the islands of Heligoland and Düne in the North Sea. The third Frisian branch, East Frisian, has only one remaining variant, Sater Frisian, spoken in the municipality of Saterland in the Lower Saxon district of Cloppenburg. Surrounded by bogs, the four Saterlandic villages lie just outside the borders of East Frisia, in the Oldenburg Münsterland region. In East Frisia proper, East Frisian Low Saxon is spoken today, which is not a Frisian language, but a variant of Low German/Low Saxon.

The Anglo-Frisian languages are a proposed sub-branch of the West Germanic languages encompassing the Anglic languages (English, Scots, extinct Fingallian, and extinct Yola) as well as the Frisian languages (North Frisian, East Frisian, and West Frisian). While this relationship had considerable support historically, many modern scholars have criticized it as a valid phylogenetic grouping. Instead, they believe that the Ingvaeonic languages comprised a dialect continuum which stretched along the North Sea, finally diverging into distinct languages – Old English, Pre–Old Frisian, and Old Saxon – during the Migration Period in the 5th century. There are still proponents of an Anglo-Frisian node in the West Germanic tree, citing strong archeological and genetic evidence for the comingling of these groups. In the 1950s, Hans Kuhn argued that the two languages diverged at the Ingvaeonic level, but later "converged". He argued that this convergence explained the striking similarity of the two languages while also explaining the issues in chronology. This view has been dismissed as improbable given the geographic divide.

The Anglo-Frisian languages have been distinguished from other West Germanic languages due to several sound changes: besides the Ingvaeonic nasal spirant law, which is present in Low German as well, Anglo-Frisian brightening and palatalization of /k/ are for the most part unique to the modern Anglo-Frisian languages:

Saterland Frisian, also known as Sater Frisian, Saterfrisian or Saterlandic (Seeltersk [ˈseːltɐsk]), spoken in the Saterland municipality of Lower Saxony in Germany, is the last living dialect of the East Frisian language. It is closely related to the other Frisian languages: North Frisian, spoken in Germany as well, and West Frisian, spoken in the Dutch province of Friesland.

East Frisian Low Saxon, East Frisian Low German or simply (but ambiguously) East Frisian is a Northern Low Saxon dialect spoken in the East Frisian peninsula of northwestern Lower Saxony.

East Frisian Low Saxon is not to be confused with the East Frisian language; the latter, spoken by about 2,000 individuals in the municipality of Saterland, is a Frisian language, while East Frisian Low Saxon is a dialect of the Low German language.