The Semengoh Arboretum in the Semengoh Forest Reserve was established in 1951 to preserve in perpetuity a small area of easily accessible, natural primary lowland forest. It covers an area of approximately 14 hectares and is one of the few least disturbed lowland dipterocarp forests near Kuching city.

The Arboretum is floristically rich with about 2,500 tree species from 60 plant families and has attracted a large number of researchers and naturalists.

It is located about 20 km from Kuching city and is accessible through the Semengoh Forest Nursery or the Semengoh Wild Life Rehabilitation Centre.