There are 276 transboundary river basins in the world (64 transboundary river basins in Africa, 60 in Asia, 68 in Europe, 46 in North America and 38 in South America). 185 out of the 276 transboundary river basins, about two-thirds, are shared by two countries. 256 out of 276 are shared by 2, 3 or 4 countries (92,7%), and 20 out of 276 are shared by 5 or more countries (7,2%), the maximum being 18 countries sharing a same transboundary river basin (Danube).
Since 1947 there have been 300 international water agreements against 37 conflicts between states over water.
The UN suggests that each person needs 20-50 litres of water a day to ensure their basic needs for drinking, cooking and cleaning.
768 million people do not use an improved source of drinking-water and 2.5 billion people do not use improved sanitation as of 2011
Today 2.5 billion people, including almost one billion children, live without even basic sanitation. Every 20 seconds, a child dies as a result of poor sanitation. That's 1.5 million preventable deaths each year.
The provision of improved sanitation and safe drinking water could reduce diarrhoeal diseases by nearly 90 per cent
Globally, diarrhoea is the leading cause of illness and death, and 88 per cent of diarrhoeal deaths are due to a lack of access to sanitation facilities, together with inadequate availability of water for hygiene and unsafe drinking water.
Resourcing of the water, sanitation and hygiene sector is relatively low priority compared to other sectors
Resourcing of the water, sanitation and hygiene sector is relatively low priority compared to other sectors. In many countries, policies and programmes underemphasise adequate financing and human resource development to sustain the existing infrastructure and to expand access to sanitation, drinking-water and hygiene services.
In Sub-Saharan Africa, treating diarrhoea consumes 12 percent of the health budget. On a typical day, more than half the hospital beds in are occupied by patients suffering from faecal-related disease.