Flax fiber comes from the bast under the surface of the stem of the flax plant. The major producers of flax are Canada, China, Russia, and India, although the UK, USA, Ethiopia, Kazakhstan, Ukraine, and Argentina also produce substantial quantities.
A natural fibre is extracted from a plant, while a Synthetic fibre is created using Polymerisation in which a saturated element is "cracked" (meaning to break the double bond) and to create a polymer. AKA. A Natural fibre is extracted from natural things. A Synthetic fibre is man-made.