Portsmouth is twinned with Duisburg, which lies on the River Rhein at the point where it is joined by the River Ruhr. We attempt to foster this twinning - at a personal and non-official level, independent of the City Council.
Visits to Duisburg have been arranged in the past, and a group from the Duisburger Portsmouthfreunde visit us every year. Over the years, strong friendships have been formed.
Knowledge of the German language is definitely not a requirement for getting involved, and
you don't need to actually live in the city of Portsmouth itself.