Pilsner (also known as Pilsener or Pils) was first brewed in Bohemia, in the modern day Czech Republic. Czech Pilsners are noted for their gold colour, malty flavour, medium to full-body and flowery hop aroma. It is commonly accepted that Pilsners should have at least 28 units of bitterness (IBU). Purists would also argue that genuine Czech Pilsner should only be brewed with barley grown in Bohemia or Moravia and with Saaz hops from the Zatec region (also Bohemia). Pilsner is popular beer style across the world.