Ambatoantrano, a remote village in the central highlands of Madagascar, is celebrated for its toilet revolution.

In the country as a whole, fewer than 10% of households have a private toilet - among the lowest rates of sanitation in the world. In rural areas these numbers are even lower; people are more likely to use a mobile phone than a loo. But in Ambatoantrano, nearly 98% of households have their own toilet.

The turning point was in early 2017, when WaterAid worked with villagers to build a gravity flow system that brought clean water from seven miles away. Although long-drop toilets don't need water to work, only ashes to neutralise the smell, the arrival of water created a spark. And the impact was dramatic. Toilets appeared, not gradually, but all at once.

Ambatoantrano, despite having no electricity or sewage works, has a higher sanitation level than Bulgaria.

The toilets were funded and designed by the villagers. An approach, say sanitation experts, that helps to make people feel more invested. It also means that each toilet is unique, shaped by the personality of its owner.