The Methuen-Pombal Link & The Demarcation of the Douro In late 2004, I started to get excited when first realizing that 2006 would represent the 250th Anniversary of the Demarcation of the Douro wine region. This Semiquincentenary is of major historical significance as Port wine has represented nearly 20% of ALL Portuguese exports for the past couple of centuries. There will be numerous celebrations and commemorations in Portugal this year.