The Rupel is a tidal river

River

A river is a natural watercourse, usually freshwater, flowing towards an ocean, a lake, a sea, or another river. In a few cases, a river simply flows into the ground or dries up completely before reaching another body of water. Small rivers may also be called by several other names, including...

 in northern Belgium

Belgium

Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...

, right tributary of the Scheldt

Scheldt

The Scheldt is a 350 km long river in northern France, western Belgium and the southwestern part of the Netherlands...

. It is about 12 km long. It flows through the Belgian province Antwerp

Antwerp (province)

Antwerp is the northernmost province both of the Flemish Region, also called Flanders, and of Belgium. It borders on the Netherlands and the Belgian provinces of Limburg, Flemish Brabant and East Flanders. Its capital is Antwerp which comprises the Port of Antwerp...

. It is formed by the confluence of the rivers Dijle

Dijle

Dyle or Dijle or historically the River Dyle in English, is a river in central Belgium, left tributary of the Rupel. It is long. It flows through the Belgian provinces of Walloon Brabant, Flemish Brabant and Antwerp...

 and Nete, in Rumst

Rumst

Rumst is a municipality located in the Belgian province of Antwerp. Since 1976 the municipality not only comprises Rumst proper but also the towns of Reet and Terhagen, which were independent municipalities before that year.Industry in Rumst, like Boom, was heavily focused around the production...

. It flows into the Scheldt

Scheldt

The Scheldt is a 350 km long river in northern France, western Belgium and the southwestern part of the Netherlands...

 at Rupelmonde

Rupelmonde

Rupelmonde is a town in the municipality of Kruibeke, in the Belgian province of East Flanders. It stands on the bank of the river Schelde opposite the confluence of the eponymous Rupel, and is famed for its sundials as well as having what is probably Belgium's only tidemill...

. Towns along the Rupel are Rumst

Rumst

Rumst is a municipality located in the Belgian province of Antwerp. Since 1976 the municipality not only comprises Rumst proper but also the towns of Reet and Terhagen, which were independent municipalities before that year.Industry in Rumst, like Boom, was heavily focused around the production...

, Boom and Niel

Niel

Niel is a municipality located in the Belgian province of Antwerp. The municipality only comprises the town of Niel proper. On January 1, 2006 Niel had a total population of 8,798. The total area is 5.27 km² which gives a population density of 1,669 inhabitants per km².-Famous inhabitants:* Jan...

. The Rupel is navigable, and forms part of the waterway to Brussels

Brussels

Brussels , officially the Brussels Region or Brussels-Capital Region , is the capital of Belgium and the de facto capital of the European Union...

.