The Arboretum de La Roche-Guyon (12 hectares), also known as the Arboretum de La Roche, is an arboretum

Arboretum

An arboretum in a narrow sense is a collection of trees only. Related collections include a fruticetum , and a viticetum, a collection of vines. More commonly, today, an arboretum is a botanical garden containing living collections of woody plants intended at least partly for scientific study...

 managed by the Office national des forêts (ONF). It is located in the regional forest (309 hectares) north of La Roche-Guyon

La Roche-Guyon

La Roche-Guyon is a commune in the Val-d'Oise department in Île-de-France in northern France.The commune grew around the Château de La Roche-Guyon, upon which historically it depended for its existence...

, Val-d'Oise

Val-d'Oise

Val-d'Oise is a French department, created in 1968 after the split of the Seine-et-Oise department and located in the Île-de-France region. In local slang, it is known as "quatre-vingt quinze" or "neuf cinq"...

, Île-de-France

Île-de-France (région)

Île-de-France is the wealthiest and most populated of the twenty-two administrative regions of France, composed mostly of the Paris metropolitan area....

, 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...

, and open daily without charge.

The arboretum was created in 1990 by the ONF. It symbolizes the geography of Île-de-France

Île-de-France (région)

Île-de-France is the wealthiest and most populated of the twenty-two administrative regions of France, composed mostly of the Paris metropolitan area....

, and contains 1821 trees reflecting the region's municipalities. Each of region's départements is represented by a mass of trees: maple

Maple

Acer is a genus of trees or shrubs commonly known as maple.Maples are variously classified in a family of their own, the Aceraceae, or together with the Hippocastanaceae included in the family Sapindaceae. Modern classifications, including the Angiosperm Phylogeny Group system, favour inclusion in...

s for the Essonne

Essonne

Essonne is a French department in the region of Île-de-France. It is named after the Essonne River.It was formed on 1 January 1968 when Seine-et-Oise was split into smaller departments.- History :...

; limes and laurels for the Hauts-de-Seine

Hauts-de-Seine

Hauts-de-Seine is designated number 92 of the 101 départements in France. It is part of the Île-de-France region, and covers the western inner suburbs of Paris...

; oak

Oak

An oak is a tree or shrub in the genus Quercus , of which about 600 species exist. "Oak" may also appear in the names of species in related genera, notably Lithocarpus...

, dogwood

Dogwood

The genus Cornus is a group of about 30-60 species of woody plants in the family Cornaceae, commonly known as dogwoods. Most dogwoods are deciduous trees or shrubs, but a few species are nearly herbaceous perennial subshrubs, and a few of the woody species are evergreen...

, eucalyptus

Eucalyptus

Eucalyptus is a diverse genus of flowering trees in the myrtle family, Myrtaceae. Members of the genus dominate the tree flora of Australia...

, blackberry

Blackberry

The blackberry is an edible fruit produced by any of several species in the Rubus genus of the Rosaceae family. The fruit is not a true berry; botanically it is termed an aggregate fruit, composed of small drupelets. The plants typically have biennial canes and perennial roots. Blackberries and...

, holly

Holly

Ilex) is a genus of 400 to 600 species of flowering plants in the family Aquifoliaceae, and the only living genus in that family. The species are evergreen and deciduous trees, shrubs, and climbers from tropics to temperate zones world wide....

, and buckthorn

Buckthorn

The Buckthorns are a genus of about 100 species of shrubs or small trees from 1-10 m tall , in the buckthorn family Rhamnaceae...

 for the Seine-et-Marne

Seine-et-Marne

Seine-et-Marne is a French department, named after the Seine and Marne rivers, and located in the Île-de-France region.- History:Seine-et-Marne is one of the original 83 departments, created on March 4, 1790 during the French Revolution in application of the law of December 22, 1789...

; beech

Beech

Beech is a genus of ten species of deciduous trees in the family Fagaceae, native to temperate Europe, Asia and North America.-Habit:...

 for Yvelines

Yvelines

Yvelines is a French department in the region of Île-de-France.-History:Yvelines was created from the western part of the defunct department of Seine-et-Oise on 1 January 1968 in accordance with a law passed on 10 January 1964 and a décret d'application from 26 February 1965.It gained the...

, and so forth. Rivers are represented by strips of lawn.