The s. c. Holasic ethnic group as a West Slavonic ethnic group in the Opava Region, the evidence of its genesis (eg. the testimony of the so called Bavarian Geographer) and the main settlement of this tribe. The meaning of the s. c. enclaves within the Moravian territory. Silesia after the War of the Austrian Heritage and the church administration. The ethnic composition and status of the s.c. Moravian ethnic group (Moravci). The issue of the s.c. Moravian dialect and the contemporary language use. The situation near the Polish border and in the s. c. Prajzská („Prussian” Region). The beginnings of the dialectological research in the Region of Opava, A. V. Šembera and his successors, local researchers. From The Czech Dialects by B. Havránek to the Czech Language Atlas (regional evidence). The characteristics of the current dialectological research in the Opava Region. The initiatives of the Matice of Silesians, the dialectological research of teachers and students from the Silesian University and monitoring of the linguistic situation. The dialect and microlanguage.