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Domain Solvay and Château de La Hulpe

Domain Solvay, Belgium

Two different walks to explore Domain Solvay, the Château de La Hulpe, the Folon Art Museum, and the surrounding woodland

Domain Solvay is located 12 km south-east of Brussels, in La Hulpe. Thousands of people visit Domain Solvay each year, picnicking on the grass or admiring the Château de La Hulpe. Yet much of the 220 hectares of the grounds remains unvisited.

On RouteYou I have added two walks you can do. This one is a short 6 km walk starting from the bus stop on Chaussée de Bruxelles. It covers the main sights described below. It’s also suitable for children, although if you are pushing a buggy you are advised to forget the path along the Argentine but keep to the parallel roadway.

This one is a longer, 10 km walk that starts from the car park at the other end of the Domain, at Drève de la Ramée, and takes you through the surrounding woodland.

One nice feature of the Domain is the abundance of benches, so you will never be short of a picnic place.


Domain Solvay can be accessed by car from junction 3 of the E411 or via the N275 Terhulpsesteenweg from the Brussels Ring. By public transport from Brussels, take TEC bus 366 (Ixelles to Court Saint Etienne) and get off at the stop called “La Hulpe Etangs Solvay”.


Domain Solvay is named after Ernest Solvay (1838-1922), who was born in Rebecq, Belgium, to a quarry master and his wife.

Ernest Solvay
Ernest Solvay

Ernest and his brother Alfred developed a new process for the industrial production of sodium carbonate. They founded the Solvay company in 1863, flirting with bankruptcy while perfecting the process. From 1870 to 1880, Ernest Solvay oversaw the global expansion of the company, setting up factories in Belgium, France, UK, Germany, Russia and the United States. Today, about 70 Solvay process plants are still operational worldwide. He used his wealth to found several scientific, philanthropic and charitable foundations.


In spring the wild flowers along the edge of the lake are superb, and include bluebell, lily of the valley, wood anemone, bugle, wild sage, marsh marigold, self-heal, ground ivy and dog violet.

Wood anemone
A white bluebell
Wood sage


A flight of steps leads from the lakeside up to the Belvedere.


The dictionary describes a Belvedere as “a small pavilion or tower, built to give a view of the scenery.” I am sure that when this Belvedere was built it offered a marvellous view of the countryside. Now, however, the trees have grown higher than the Belvedere, so all you see are leaves. But it’s good exercise to climb the steps — all 147 of them.


The woods are part of the great Sonian Forest, a 43 square kilometre mixed woodland that was once part of a huge forest that stretched from the Rhine and Moselle rivers in Germany to the North Sea.


As the population of Belgium grew, the forest began to shrink as woodland was converted into fields. Some degree of protection was afforded in the 12th century by the Duke of Brabant, who established the forest as a hunting ground. In the 1730s, tree nurseries were created, along with jobs for 19 foresters and four tree inspectors. Shortly after Belgium gained independence in 1830, the Belgian State bought the forest. Thanks to a Royal Decree, the Sonian Forest has enjoyed protected landscape status since 1959.

I enjoy seeing the occasional red squirrel and roe deer in the woods, as well as a variety of birds. Common ones include treecreeper, nuthatch, jay, buzzard, green woodpecker and great spotted woodpecker, while rarer ones include lesser spotted woodpecker, black woodpecker and woodcock.


This strange 36-metre high tower was built by Ernest John Solvay, the grandson of Ernest Solvay. It has a 4.5 metre diameter sun on top. It is said that he built it so that he could look at “the sun” each morning from his west-facing bedroom in the château.

The obelisk in Domain Solvay


The Château farm ceased to be a working farm in 1971. It has been converted by the Folon Foundation into a permanent exhibition of over 500 works of the Belgian artist Jean-Michel Folon (1934-2005). It includes watercolours, engravings, posters and sculptures, along with music, films and optical effects. It is open every day except Mondays, from 10.00 to 18.00. Admission fee is 7.50 EUR or 5 EUR for children.

Jean-Michel Folon was born in Uccle in 1934. As a child, he lived near to La Hulpe, and was a frequent visitor to the park, which he described as “the garden with the thousand rhododendrons.”

Folon was a very versatile artist, involved in drawing, painting, etching and sculpting. He illustrated books for writers such as Kafka, H.G. Wells and Ray Bradbury, magazines such as Time and New Yorker, and painted murals such as the one in the Brussels metro station Montgomery. He designed posters for humanitarian causes. In 1988 he illustrated the Universal Declaration of Human Rights for Amnesty International, and in 2003 became Ambassador for Unicef.

Folon exhibited across the world: New York (first in 1969 and later in 1990 at the prestigious Metropolitan Museum of Art), Milan, Paris, Rotterdam, London (Institute of Contemporary Art), Antibes (the Picasso museum), Venice, Buenos Aires and Tokyo. He died in Monaco on 20 October 2005.


The centrepiece of Domain Solvay is the Château de La Hulpe.


It looks like it’s been airlifted in from the Loire Valley, but was actually built here by the Marquis of Bethune in 1842. At the end of the 19th century, wealthy Belgian industrialist Ernest Solvay acquired the property. In 1968 the Solvay family donated the château and park to the Belgian government, although only the grounds, not the château itself, are accessible to the public.

The French-style gardens of the château include large statues of Mars, the God of war, and Minerva, the goddess of wisdom and the crafts; and smaller ones representing the four seasons.


The footpath indicated follows the small stream called the Argentine. On the other side of the stream is the Nysdam nature reserve belonging to Natagora, the Belgian nature conservation organisation.

I like walking along the Argentine in Spring as it’s full of wild flowers: butterbur, red and white campion, comfrey, ragged robin, wild strawberry, Solomon’s seal, cowslip, cuckoo pint and a wild orchid called the common twayblade. A favourite of mine is ramsons. I can often smell it before I see it, as it’s also known as wild garlic. Its leaves can apparently be used in salads, but I haven’t tried it yet.

Ramsons or wild garlic

Further along the path you will get good views over the lake, where you should be able to identify birds such as pochard, tufted duck, great crested grebe, Canada goose and heron. In the spring and summer, swallows, house martins and sand martins are fond of flying over the lake to catch insects.

Around the marshy edges, look out for coot, moorhen and the water rail. The water rail is fairly common in the Nysdam nature reserve, but it is difficult to see, as it usually skulks in the reed beds. You are more likely to hear its strange call, which has been likened to a squeaking piglet.

Two other birds you are more likely to hear than see are the reed warbler and sedge warbler. Both emit loud, rambling, long-lasting warbles full of trills and whistles. They also mimic other birds — even the squeaking piglet call of the water rail!

I hope you enjoy your walk around Domain Solvay. Subscribe to Discovering Belgium by adding your email below. You’ll get all new posts delivered into your inbox.

34 thoughts on “Domain Solvay and Château de La Hulpe”

  1. What an interesting area that is. And, thanks to your post, I now know what sodium carbonate is, and what it is used for. Thanks for making me do some research.

    Happy New Year, Denzil.

    1. I’ve never seen so many, Carol. I think someone mistyped an order and got 100 instead of 10. Other places I can walk for miles, yearning for a picnic bench, but here I was tripping over them every few minutes.

  2. What a great and diverse walk, Denzil. I love that obelisk! Each time I climb to a viewpoint and all I can see is trees and foliage, I never know whether to curse that there is no view and think they should trim the trees, or whether to be happy that they are letting nature take over! But, as you said… it is always good exercise to climb!

  3. This is such an informative post, filled with beautiful images. No, I never heard of Ernest Solvay. What an amazing man. You have to admire an inventor or industrialist that “flirts with bankruptcy”, then goes on to produce a product that is needed where it makes a difference with his production of sodium carbonate. To have plants worldwide too! The fact that he was philanthropic makes him a great human being.

    1. Absolutely true Donna. Solvay is now a huge international company. There’s a Solvay Library in Brussels which is used for prestigious events (I’ve never been there though).

  4. You are certainly opening my eyes to the delights of a country I admit to knowing precious little about, so thank you for that. Your narrative and gorgeous photographs have certainly sold this place to me – it looks amazing and ticks all the boxes for many perfect days out, walks, wildlife, history, architecture and art, what more could one ask?

    1. Thanks for your positive comment Theresa. Maybe you’ll get chance to visit Belgium one day (or longer?). Yes, this place certainly has a bit of everything. Did I mention ice-cream vans in the summer too? 🙂

        1. Theresa, I deliberately didn’t mention the vans that look like ice-creams vans but sell warm waffles, otherwise you would have been rushing to the travel agent to book a flight already …!

  5. Great article and photos. I love taking walks outdoors and photographing plants and animals. Hopefully, I can make it to Belgium one day and see some of these places in person.

  6. Prachtig artikel over domein Solvay en kasteel De la Hulpe.Wat is het daar prachtig.Zelf ben ik nog nooit geweest maar in het Zonienwoud heb ik al wel gewandeld.
    Mag ik er je even opwijzen dat de benaming onder de witte bloempjes aan de stengel,”meiklokje of lelietje van dalen” foutief is.Dit is een wilde hyacint.Meiklokjes hebben piepkleine ronde bolvormige bloempjes aan een stengel en een breed ovaal blad.Deze bloem is zoals ik al zei een wilde hyacint de bloempes aan de stengel zijn groter en klokvormig en het blad is smal en lang,dat kan je goed op de foto zien.Je mag nadien de informatie over de bloempjes verwijderen uit mijn bericht.

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