Unterjeckenbach borders in the north on the municipality of Sien in the east on the municipality of Langweiler, in the south on the municipality of Homberg and in the west on the Baumholder troop drilling ground.
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Particular names for Unterjeckenbach then also crop up in the historical records, such as Sienjeckenbach (1448, after neighbouring Sien) and Frygechenbach (1448).
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This was evacuated after Adolf Hitler came to power in 1933, along with 14 other villages in the region, to make way for the Baumholder troop drilling ground.
According to the document, the magistrates denied Waldgrave Friedrich of Kyrburg any rights to the villages of Schweinschied, Kappeln, Löllbach, Langweiler, Käsweiler (vanished before 1500), Sulzbach, Homberg, Kirrweiler, Oberjeckenbach (cleared out in 1933 by the Nazis to make way for the Baumholder troop drilling ground) and Unterjeckenbach.
Langweiler borders in the north on the municipality of Sien, in the northeast on the municipality of Hoppstädten, in the east on the municipality of Merzweiler, in the south on the municipality of Homberg and in the west on the municipality of Unterjeckenbach.