The dataset contains delimitation of borders of dialect regions, subgroups, areas and types in the Czech Republic. It is the result of an extensive expert revision that was based on various sources and made the delimitation exact and accurate. At the same time, the dataset corresponds to the underlying data of the Mapka application running at https://korpus.cz/mapka/

There are four files in this submission. Two files contain the delimitation of dialect regions ("oblasti"; both in GeoJSON and Shapefile formats) and two files contain the delimitation of smaller dialect areas, i.e. subgroups, areas and types ("oblasti_jemne"; again in GeoJSON and Shapefile formats).