Abstract-Tourism has developed as a new form of service industry for alternative and sustainable socio-economic development of a country. Tourism industry has widely implemented Web based Geographic Information System, in order to improve information sharing, monitoring-planning and overall tourism and destination management. Geospatial Mashup is an interactive and collaborative Web 2.0 application that helps in integrating heterogeneous data from various resources to create internet based collaborative geospatial information system. This research paper focuses on the fact that, Geospatial Mashups have a huge potential in the field of tourism marketing and promotion. The current study also highlights on the basic architecture, working principles and effective implementation of Mashup technology in tourism industry.