The Tour of Flanders (Dutch: Ronde van Vlaanderen), also known as De Ronde ("The Tour"), is an annual road cycling race held in Belgium every spring. The most important cycling race in Flanders; it is part of the UCI World Tour and organized by Flanders Classics.
Today it is one of the five monuments of cycling, together with Milan–San Remo, Paris–Roubaix, Liège–Bastogne–Liège and the Giro di Lombardia. It is one of the two major Cobbled classics together with Paris–Roubaix, which is on the calendar one week after the Tour of Flanders. The event had its only interruptions during World War I and is organized without hiatus since 1919, the longest uninterrupted streak of any cycling classic.