Question: How many children work year round in the continent where the river the Tekeze river turns into is located?

the cuyuni river is a south american river and a tributary of the essequibo river. it rises in the guiana highlands of venezuela where it descends northward to el dorado, and turns eastward to meander through the tropical rain forests of guyana. it finally turns southeastward, flowing to its confluence with the mazaruni river. the cuyuni river marks the limit of the disputed territory of guayana esequiba for approximately . <SEP> The Tekezé River rises in the central Ethiopian Highlands near Mount Qachen within Lasta, from where it flows west, north, then west again, forming the westernmost border of Ethiopia and Eritrea from the confluence of the Tomsa with the Tekezé at to the tripoint between the two countries and Sudan at . The Tekezé is perhaps the true upper course of the Atbarah, as the former follows the longer course prior to the confluence of the two rivers. After entering northeastern Sudan at the tripoint it joins the Atbarah River, which is a tributary of the Nile. <SEP> Children working at a young age has been a consistent theme throughout Africa. Many children began first working in the home to help their parents run the family farm. Children in Africa today are often forced into exploitative labour due to family debt and other financial factors, leading to ongoing poverty. Along with 30 percent of children who are picking coffee, there are an estimated 25,000 school age children who work year round. Other types of domestic child labour include working in commercial plantations, begging, and other sales such as boot shining. In total, there is an estimated five million children who are currently working in the field of agriculture which steadily increases during the time of harvest. <SEP> The Atbarah River (; transliterated: Nahr 'Atbarah) in northeast Africa rises in northwest Ethiopia, approximately 50 km north of Lake Tana and 30 km west of Gondar. It flows about 805 km (500 mi) to the Nile in north-central Sudan, joining it at the city of Atbarah (). The river's tributary, the Tekezé (Setit) River, is perhaps the true upper course of the Atbarah, as the Tekezé follows the longer course prior to the confluence of the two rivers (at 14° 10' N, 36° E) in northeastern Sudan. The Atbarah is the last tributary of the Nile before it reaches the Mediterranean. <SEP> small-scale artisanal mining of gold is another source of dangerous child labour in poor rural areas in certain parts of the world. this form of mining uses labour-intensive and low-tech methods. it is informal sector of the economy. human rights watch group estimates that about 12 percent of global gold production comes from artisanal mines. in west africa, in countries such as mali - the third largest exporter of gold in africa - between 20,000 and 40,000 children work in artisanal mining. locally known as orpaillage, children as young as 6 years old work with their families. these children and families suffer chronic exposure to toxic chemicals including mercury, and do hazardous work such as digging shafts and working underground, pulling up, carrying and crushing the ore. the poor work practices harm the long term health of children, as well as release hundreds of tons of mercury every year into local rivers, ground water and lakes. gold is important to the economy of mali and ghana. for mali, it is the second largest earner of its export revenue. for many poor families with children, it is the primary and sometimes the only source of income.