Flensburg is a busy centre of trade and industry, and is the most important town in what was formerly the duchy of Schleswig.
Flensburg was probably founded in the 12th century.
At Flensburg in Schleswig he secured control of the largest Baltic shipping concern, and proceeded to build a new fleet of ships, christening one of them the " Hindenburg."
He was educated at the Flensburg gymnasium and the universities of Kiel and Berlin.
A line from Flensburg south-westward to Joldelund and thence northwestward to Hoyer will nearly give the boundary between the two idioms.i The German-French frontier traverses Belgium from west to east, touching the towns of St Omer, Courtrai and Maastricht.