Nižbor is a municipality and village in Beroun District in the Central Bohemian Region of the Czech Republic. It has about 2,100 inhabita…Nižbor is a municipality and village in Beroun District in the Central Bohemian Region of the Czech Republic. It has about 2,100 inhabitants. The local castle was originally named Miesenburg, meaning "castle upon Mže"). Later it was distorted to Nižbor.