Abstract
Applying the system and spatial approach in studying diverse aspects of nature disaster risk occurrence in Arda River Basin, Bulgaria, makes possible researching risk within its triggering sources, interactions and impacts on Social, Eco and Geosystem. Implementation of the Interpretive Structuring Method analysis techniques provides for recognizing the social, ecological and geosystem, finding out the relationships between elements of the 3 systems, categorizing and ordering elements. Revealing spatial aspects of nature disaster risk by GIS enables to map it and determine the extent of risk exposure by processing and analyzing various types of spatial and attributive geo-information.
