This paper introduces a scalable virtual learning environment of the Chinese University of Hong Kong; an explicitly geographical, immersive, and sharable 3D learning space with comprehensive social elements. It is characterized by multi-user collaborative modeling, group learning approaches of geo-collaboration, social space-oriented hierarchical avatars, and knowledge exchanging and sharing based on virtual geographic experiments. Applications for the purpose of public education and virtual geographic experiment, and indicated future works prove the possibility to offer a greater opportunity to foster interdisciplinary collaborations, revitalize teaching patterns and learning contents, improve learners' cognitive abilities to solve problems, and enhance their understanding of scientific concepts and processes.[Copyright of Taylor & Francis. Full article may be available at the publisher's website: http://dx.doi.org/10.1080/17538947.2010.535028]