Derborence Island, an inaccessible concrete structure set in the middle of Lille’s Parc Henri Matisse, is an intriguing example of recent landscape design. The park, which was completed in 1995 as part of the vast Euralille development, was designed by the French landscape architect Gilles Clément. The idea for the park is derived from several sources, including the aesthetic characteristics of uncultivated ground, the symbolic reconstruction of a fragment of primary forest and the enhancement of urban biodiversity. It is suggested that Clément’s novel synthesis of nature and culture is significantly different from prevailing discourses of landscape design and is best interpreted as a form of site‐specific art. Clément’s project reveals tensions between the aesthetic and scientific significance of so‐called ‘waste spaces’ in contemporary cities and the widening scope of utilitarian approaches to landscape design.