Pont de lianes de Poubara, Liana bridge in Franceville, Gabon.

The Poubara liana bridge is a 52-meter structure spanning the Ogooué River, built entirely from intertwined lianas and natural materials. The design relies on the flexibility and strength of these vines to create a walkway without any metal components.

The liana bridge was built in 1915 so that the people of Poubara village could cross the Ogooué without using canoes in its turbulent waters. It originally measured 120 metres; the present structure is 52 metres long. Its upkeep is funded by the crossing fees collected by a descendant of its designer.

The bridge takes its name from the nearby Poubara Falls on the Ogooué. It is kept up by a descendant of its designer, who funds maintenance from the tolls paid by those who cross. Visitors can watch the woven liana walkway and the river below.

The bridge crosses the Ogooué just upstream of the Poubara falls, south of Franceville in eastern Gabon. It is reached from the village of Poubara, on the river's right bank; the descendant of the builder collects a passage fee that funds maintenance. The deck is woven from lianas and moves underfoot, so cross one person at a time.

The bridge is kept up by a descendant of its designer, who pays for its maintenance with the crossing fees collected from users. The structure is woven from 2,400 lianas, entirely in natural materials, and has shrunk from 120 metres originally to 52 metres today.