The State Archive of the Russian Federation (GARF) contains a corpus of around one hundred letters sent by \uc9lis\ue9e Reclus to P\uebtr Kropotkin between 1882 and 1905. The correspondence is mainly concerned with their geographical works, notably the collaboration of Kropotkin with the Nouvelle G\ue9ographie Universelle (1876-1894) and the Brussels edition of Kropotkin's Orographie de la Sib\ue9rie (1904), edited by Reclus. In this paper, we deal first with the importance of this source: it is an example of the material work of a network of geographers who were at the same time the founders of the international anarchist movement. We suggest the correspondence falls into two parts: the first period (1882-1886) when Reclus was in exile in ...