Latvian language
Upper Latvian dialect is spoken in Eastern Latvia. It is set apart from rest of the Latvian by number of phonetic differences. The dialect has two main varieties – Selonian and Non-Selonian. There is a standard language, the Latgalian language, which is based on deep Non-Selonian varieties spoken in south of Latgale. The term "Latgalian" is sometimes also applied to all Non-Selonian varieties or even the whole dialect. However, it is unclear if it is accurate to use the term for any varieties besides the standard language. While the term may refer to varieties spoken in Latgale or by Latgalians, not all speakers identify as speaking Latgalian, for example, speakers of deep Non-Selonian varieties in Vidzeme explicitly deny speaking Latgalian.
Baltic states
The Estonian language is a Finnic language, together with neighboring Finland′s Finnish language.
Apart from the indigenous languages, German was the dominant language in Estonia and Latvia in academics, professional life, and upper society from the 13th century until World War I. Polish served a similar function in Lithuania. Numerous Swedish loanwords have made it into the Estonian language; it was under the Swedish rule that schools were established and education propagated in the 17th century. Swedish remains spoken in Estonia, particularly the Estonian Swedish dialect of the Estonian Swedes of northern Estonia and the islands (though many fled to Sweden as the Soviet Union invaded and re-occupied Estonia in 1944). There is also significant proficiency in Finnish in Estonia owing to its closeness to the native Estonian and also the widespread practice of listening to Finnish broadcasts during the Soviet era. Russian also achieved significant usage particularly in commerce.