Despite government efforts Rwanda has one of the highest repetition efforts even in Africa, and no doubt ongoing sectarian violence has contributed to this. The school language of instruction is Kinyarwanda at primary level, and then French and English thereafter, and at University too. The period spent at primary school is nominally 6 years.
Rwanda has many lakes. The largest, Lake Kivu, is located in the midst of the volcanic peaks in the Virunga Mountains and forms part of the border with the Democratic Republic of the Congo. The lake has a surface area of 2,665 square kilometers (1,025 square miles) and reaches a maximum depth of 475 meters (1,558 feet).
According to the 2010 revison of the World Population Prospects the total population was 10 624 000 in 2010, compared to only 2 072 000 in 1950. The proportion of children below the age of 15 in 2010 was 42.6%, 54.7% was between 15 and 65 years of age, while 2.7% was 65 years or older .