Sonian Forest
Zoniënwoud
The Sonian Forest, covering an area of ca. 4400 ha, is the largest and best preserved remnant of the historical Silva Carbonaria, commonly known as the charcoal forest, that in the 4th century still stretched from Thuin to Brussels. It has a large geomorphological value because significant sections on the Loess plateau had never been felled in history, thus retaining the characteristics of a primeval forest. The highest point reaches 133 m above sea level. The source of the IJse is in the centre of the Sonian Forest, and its trajectory spawned countless ponds, creeks and marshes. Archaeological evidence of human activity in the Sonian Forest has been traced back to neolithic remains over 5000 years old. Remains of iron ore smelters from the Carolingian era have also been found. It is presumably under the reign of Charles the Great (768-814) that the Sonian Forest got split off from the Silva Carbonaria and developed an independent fauna and flora. Under Austrian reign in the 18th century, thousands of beech trees were planted, which is still visible. From the 18th century onwards, the forest saw increasing economic importance: several monasteries and priories were built in and around it, and the countless ponds served to provide them with a supply of fish whereas the forest itself had a hunting ground function. Nearly nothing of these buildings remains, but the intense network of droveways reveals their historic locations and importance. Under French rule, from 1794 to 1814, the Sonian Forest was nationalised, and large areas were felled for economic reasons. After the Belgian independence of 1830, parts of the forest were sold off to individuals to fill the new country's treasury, but in 1843 it became property of the state. The first half of the 19th century brought new disaster to the forest, however, when in 1832 the General Society (Société Generale) started the construction of roads that cut the forest in smaller pieces. A railway connection between Brussels a
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Listing from Wikivoyage: Kraainem, CC BY-SA 4.0.
Updated 28 Sept 2026. Something wrong? Tell us.