Biert is a hamlet in the Dutch province of South Holland. It is located in the municipality of Nissewaard, about 3 km west of Spijkenisse.
Biert was a separate municipality between 1817 and 1855, when it became part of Geervliet.Ad van der Meer and Onno Boonstra, "Repertorium van Nederlandse gemeenten", KNAW, 2006.
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