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Where was Old High German spoken?

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Thematic map of Europe displaying the distribution of Germanic languages, with different colors indicating regions where English, German, Netherlandic (Dutch), Frisian, Swedish, Danish, Norwegian, Icelandic, and Faroese are spoken. Striped areas mark regions where bilingualism is common, and language regions cover countries such as the United Kingdom, Germany, the Netherlands, Denmark, Sweden, Norway, Iceland, and parts of surrounding countries. — West Germanic languages Distribution of the Germanic languages in Europe.

Old High German refers to the collection of West Germanic dialects that were spoken in the highlands of southern Germany, Switzerland, and Austria until the end of the 11th century.1

The speech area included:
* Upper German dialects: Comprising Alemannic (Swiss German) and Bavarian.1
* Franconian (Frankish) dialects: Including East Franconian and Rhenish Franconian, which were spoken just north of the Upper German area, as well as Central Franconian dialects spoken along the Moselle and Rhine rivers.1