The Bras de Bronne is a small 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 France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

 whose 11 km course crosses the departement of the Pas-de-Calais.
Its source is at the hamlet

Hamlet

The Tragical History of Hamlet, Prince of Denmark, or more simply Hamlet, is a tragedy by William Shakespeare, believed to have been written between 1599 and 1601...

 of Etreuille, near the village of Saint-Michel-sous-Bois

Saint-Michel-sous-Bois

Saint-Michel-sous-Bois is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Saint-Michel-sous-Bois is located 9 miles northeast of Montreuil-sur-Mer on the D129 road.-Population:-References:*...

. It flows through the communes of Humbert

Humbert, Pas-de-Calais

Humbert is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Population:-References:* -External links:*...

, Sempy

Sempy

Sempy is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Sempy is located 4 miles southeast of Montreuil-sur-Mer on the D129 road, alongside the banks of the small Bras de Brosne river.-Population:...

, Aix-en-Issart

Aix-en-Issart

Aix-en-Issart is a commune in the Pas-de-Calais department in northern France.-Geography:A small village situated some 5 miles east of Montreuil-sur-Mer, at the D149 and D129 crossroads, by the banks of the small river Bras de Brosne, a tributary of the Canche.-Population:-External links:* ...

, Marant

Marant

Marant is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Marant is situated 3 miles east of Montreuil-sur-Mer, on the D129 road.-Population:-External links:*...

, Marenla

Marenla

Marenla is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Marenla is situated 5 miles southeast of Montreuil-sur-Mer, on the D113 road.-Population:-References:* -External links:*...

 and joins the river Canche

Canche

The river Canche is one of the rivers that flow from the plateau of the southern Boulonnais and Picardy, into the English Channel. The Somme is the largest example. The basin of the Canche extends to 1,274 square kilometres and lies in the southern end of the département of Pas-de-Calais...

 at Marles-sur-Canche

Marles-sur-Canche

Marles-sur-Canche is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Marles-sur-Canche is situated in the valley of the Canche river, 2.3 miles southeast of Montreuil-sur-Mer, on the D113 road....

.

In winter, it is fed by an even smaller river at the commune of Quilen

Quilen

Quilen is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Quilen lies 10 miles northeast of Montreuil-sur-Mer on the D129E1 road...

.

There’s an ancient watermill

Watermill

A watermill is a structure that uses a water wheel or turbine to drive a mechanical process such as flour, lumber or textile production, or metal shaping .- History :...

 at Sempy

Sempy

Sempy is a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France.-Geography:Sempy is located 4 miles southeast of Montreuil-sur-Mer on the D129 road, alongside the banks of the small Bras de Brosne river.-Population:...

.