The Bangkok Metropolitan Administration plans to open the world's first public park across a river this month.

The Chao Phraya Skypark spans the river, linking Khlong San and Phra Nakhon districts.

The BMA has spent 123 million baht landscaping the 280-metre-long and 8.5-metre-wide Phra Pok Klao Bridge.

The structure was dubbed "Saphan Duan", meaning the incomplete bridge, after it was abandoned when a 55-billion-baht, 90-kilometre-long Skytrain project went bankrupt and was scrapped in 1992.

The year-long park development has seen the installation of plants, ramps, elevators, viewpoints, rest areas and various levels of paths for pedestrians and cyclists, who will be allowed only to walk their bikes across the river.

"The project's success is the result of cooperation from all involved. It will be opened before the end of  this month, and Prime Minister Prayut Chan-o-cha has been invited to open it," Bangkok governor Aswin Kwanmuang said.

The project designer said the Chao Phraya Skypark was the world's first skypark above a river.