This article studies the nature of links between solidarity-based finance and territories in two French West regions: Bretagne and Pays-de-la-Loire. We show how the theoretical links must be set up in two disciplinary fields of regional and economic geographic and, of proximities economics. So, we try to examine methods and empirical studies which allow crossing those two fields for understanding the expansion of solidarity-based finance in this meta-region of French North-West. Our research program (FIMOSOL (Solidarity-based currencies and finance)) was financed by the Interministerial Delegation at Social and Experimental Innovation and Social Economy (DIIESES) in 2006-2007.