The study is undertaken to Factors affecting geo-tourism development in Erta ale, North EastrnEthiopia. In order to answer the research question both close ended and open endedrnquestionnaire were developed and distributed for one hundred international tourists and fortyrntour operators. In addition to focus group discussion, interview and non participant observationrnwere tools for data collection. It relied on both primary and secondary data. The study isrnexpressed as a descriptive study with both qualitative and quantitative methodologicalrnapproaches. Therefore, both qualitative and quantitative types of method have been jointlyrnimplemented.International tourists who had an experience of visiting Erta Ale active volcano, key informantsrnfrom Afar region culture and tourism office, local residents, tour guides selected using nonrnprobability purposive sampling whereas tour operators were randomly selected from AddisrnAbaba. After collecting the data, the qualitative data were analyzed through interpretive andrndescriptive method. On the other hand, the qualitative data were analyzed with the help ofrnstatistical package for social science (SPSS) version 16.0.rnThe finding revealed that insecurity and bad image of the destination, poor marketing andrnpromotion, lack of basic infrastructure, lack of trained human resource are factors affecting geotourismrndevelopment of the study area.Key words: Geo tourism, SPSS (Statistical Package for the Social Science).