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Lasne is a Walloon municipality in the Belgian province of Walloon Brabant, south east of Brussels. In 2008, Lasne had a population of 14,043. The total area is 47.22 km² which gives a population density of 297 inhabitants per km². Lasne is the richest municipality in Wallonia, measured by the average taxable income of the inhabitants. It also has the lowest local taxes of any municipality in Belgium.

It was formed from the fusion of five municipalities:

  • Couture-Saint-Germain,
  • Lasne-Chapelle-Saint-Lambert,
  • Maransart,
  • Ohain
  • Plancenoit.

While the municipality has taken the name of Lasne, the administrative offices are in the village of Ohain.

Ohain contains an example of a Brabant-Wallon village green: almost triangular in shape and sloping gently. The green contains many mature trees and is bordered on 2 sides by old houses and shops. The church in Ohain was built around the year 1200 and the strongly built square tower dates from this time.

The village of Couture-Saint-Germain contains the ruins of the Cistercian Abbey of Aywiers which has been the subject of pilgrimages since the late 19th century in honour of Saint Lutgarde who lived there for 30 years in the first half of the 13th century.

Much of the Battle of Waterloo was fought in the village of Plancenoit, notably around the church and the fortified farm of La Papelotte. The cemetery wall is said to still contain holes made by musket balls. It was in Plancenoit that Blücher's troops engaged Napoleon's army, having marched from Wavre. Blücher and Wellington met after the battle at the farm ' La Belle Alliance' - now a bar. The current historic area commemorating the battle is jointly administered by the municipalities of Lasne, Waterloo and Braine-l'Alleud.