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The connotation, initial characteristics and the development trend of association and integration of the three concepts of metaverse, digital twin and virtual geographic environment are scrutinized. The concept of geographic metaverse is proposed, and three types of digital geographic environments of geographic metaverse are defined and distinguished based on the relationship between virtual and real contents and the parallel superposition of virtual and real spaces, that is, the virtual geographic environment of digital native, the virtual geographic environment of digital twin, and the augmented geographic environment of digital-real superposition,.The essential characteristics of the geographic metaverse are discussed in terms of time-space, avatar, spatial reference system, and presence-absence. Based on the human-earth relationship and the technical requirements of geographic metaverse construction, the conceptual architecture of geographic metaverse platform is established. In the face of the emerging virtual geographic space, avatar society and virtual-real composite human-land relationship system, we propose to establish virtual geographic environment engineering and promote the construction of geographic metaverse platform and related theoretical application research.