Art Biotop Water Garden, an artificial landscape by Junya Ishigami near the Nasu Mountains in Japan, has won the inaugural Obel Award.
Ishigami's Art Biotop Water Garden was selected by the jury for demonstrating how human intervention can enhance a landscape, rather than damaging it.
The water garden, which is attached to artist's retreat Art Biotop, is formed of 318 trees planted around 160 small ponds.
Ishigami, who founded Junya Ishigami and Associates in 2004, was the designer of this year's Serpentine Pavilion in London.
The project attracted controversy at the time when allegations were made that Junya Ishigami and Associates did not pay its architecture interns.