used more widely during the 20th century, mostly among historians and ethnographers. The northeastern limit of the area of Prussia inhabited by Lithuanians was the state border between Lithuania and Prussia, and the northern border was along the Nemunas River, but the southwestern limit was not clear. Thus, the territory of Lithuania Minor has been understood differently by different parties; it could be: either the area limited in the south by Max Toeppen – Adalbert Bezzenberger's line (about ) what is roughly the area of the former administrative Lithuania Province (about ), where the population was almost entirely Lithuanian until 1709–1711, or the area of the former region with actual Lithuanian majority or of considerable percentage (about 17–18,000 km2 or 6,500–7,000 sq mi). The administrative terms "Lithuanian province" (), "Lithuanian districts" (), "Lithuanian county" () or simply "Prussian Lithuania" (), "Lithuania" () were used to refer to the Lithuanian inhabited administrative units (Nadruvia and Scalovia) in the legal documentation of Prussian state since 1618. The Lithuanian Province was named , , , Little Lithuania, Litvania in the maps of Prussia since 1738. The official use of the concepts Prussian Lithuania etc. decreased considerably from the administrative reform of 1815–1818. Geography The area of Lithuania Minor embraced the land between the lower reaches of the river Dangė to the north and the major headstreams of the river Pregolya () to the south. The southwestern line ran from the Curonian Lagoon along the Deimena River to its south, continued along the Prieglius River to the Łyna () river, up to the town of Alna and hence southward along the Ašvinė river to Lake Ašvinis and from there eastward to the border of Lithuania Major. The region embraced about 11 400 km². The broader understanding of Lithuania Minor includes the area west from the Łyna and south form the lower reaches of the Prieglius and the Sambian Peninsula, making up 17–18 thousand km2 in total. The former ethnic region of Lithuania Minor belongs to different states today. The part of Kaliningrad Oblast (excluding the city of Kaliningrad and its surroundings), a few territories in Poland's Warmian-Masurian Voivodeship, as well as the following territories in modern-day Lithuania: the Klaipėda district municipality, the Šilutė district municipality, Klaipėda city, Pagėgiai municipality, and Neringa municipality had once ethnically, linguistically and culturally been the latter Lithuanian region. Although now divided among countries, Lithuania Minor had been intact formerly,