Nigeria and Niger, in West Africa, are neighbouring states. But the two countries have more than a border in common; they are also share a number of river basins that are under threat, and the responsibility for conserving them.
The Aymara community of Cancosa on the Chilean Altiplano region of Tarapacá, bordering Bolivia, will spare no effort in its struggle to rehabilitate a wetland dried out by the Cerro Colorado Mining Company (CMCC), an affiliate of the Anglo-Australian BHP Billiton company.
Sylvestre Munyalibanje has been accustomed to farming in the Rwandan district of Rutsiro, on the shores of Lake Kivu. But now, he's facing the end of an era.
A Vietnamese academic has developed a small following over the past two years for his views about the waters that inundate the Mekong delta. The seminars he attends ends with participants wanting to know more.
China is emerging as a new backer of massive dam projects around the globe, giving rise to fears for pristine natural resources and the cultural heritage of river peoples.
For many people, the importing of tomatoes is probably not a topic of great fascination. But then, they're not Sylvestre Fandohan.
The idea of water wars to follow soon in the wake of oil wars has been around as another doomsday scenario for a while. But a dismissal of the scenario as something that has not materialised, and will not, has meant also an under-rating of the potential for conflict that continues to float around water sharing.
Over the course of the 1990s, grave warnings were occasionally aired about the role of water in Middle Eastern power politics. In 1991, former Egyptian foreign minister Boutros Boutros- Ghali, shortly before he was appointed UN secretary-general, ominously predicted that "the next war in the region will be over water."
Kenya's capital, Nairobi, takes its name from a Maasai word meaning "place of cool waters". In parts of the city, however, this term is less descriptive than ironic - as demand for water is outstripping supply.
Austrian composer Johann Strauss wrote the Blue Danube waltz in 1867, but 140 years later the waters of the river are not quite blue, and no one is sure they will be again.
In a State of the Nation address delivered in February, South African President Thabo Mbeki said his country had "already achieved the Millennium Development Goals in respect of basic water supply, with improvement of access from 59 percent in 1994 to 83 percent in 2006."
Halfway to 2015, the year when the globally agreed Millennium Development Goals (MDGs) are supposed to be reached, the crisis in water and sanitation as well as in water resources management remains among the great human development and environmental challenges.
An impressive crop of sweet potatoes, yams, cabbages, cucumbers, carrots and tomatoes has spelt a good season for Burkinabé farmer Amadou Diallo, who attributes his success to a nearby water storage tank.
A strong link between droughts and violent civil conflicts in the developing world bodes ill for an increasingly thirsty world, say scientists, who warn that drought-related conflicts are expected to multiply with advancing climate change.
Stretching over more than 4,000 kilometres, the Niger is West Africa's longest river, and greatly threatened in the country of the same name by environmental degradation that is causing the water course to silt up.
Alexis Kaboré, a resident of the suburb of Pissy in Burkina Faso's capital, Ouagadougou, is not connected to the potable water network of the National Office of Water and Sanitation (Office national de l'eau et de l'assainissement, ONEA): he simply can't afford to do so on his salary, even though the costs of the link have come down.
The Niger river snakes through nine countries in West Africa before emptying into the Atlantic Ocean. It is an epic 4,200 kilometres in length, provides sustenance to millions of people - and has trouble brewing at its source.
For people who arrive at the international airport in Nairobi, Kenya's fabled wildlife can be glimpsed almost immediately, in the Nairobi National Park which borders the airport. Driving out of this facility en route to the city, there's a chance of sighting black rhino, zebras and giraffe: just some of the many species that inhabit the park.
While the recent stakeholders' conference on the Zambezi River Basin saw many good intentions expressed, it also served as a reminder of the persistent challenge posed by weak co-operation between Southern African states.
Seventy percent of the Zambezi river's hydropower potential remains untapped because stakeholder countries have failed to ratify an agreement as the first step towards activating this potential.
Stakeholders in the Zambezi River Basin are holding their annual meeting this week with the aim of matching their needs with a commitment to action.