The D.R. Congo is a country in Central Africa with the capital Kinshasa and an area of : 2.345.410 km2, having French as official language and 4 national languages. It shares its borders with nine neighboring countries with which it maintains good relations. It is a country with a very rich soil and subsoil, with an important hydrography and a fascinating history, the D.R.Congo is worth being known in the world. In this book "Let's have the mastery of the D.R.Congo" we have talked about the physical-economic geography of the D.R.Congo, its history since its origins, its colonization and its decolonization in order to allow the reader to have a global idea about the D.R.Congo.