This video is a demo of a work developed in the AVRGroup of UFJF/Brazil where a free hand interface for modeling virtual terrains in an augmented reality environment was presented. A secondary contribution of this work was to present a study of a set of suitable gestures that allows the manipulation of virtual terrains interactively, using augmented reality markers and the Leap Motion Controller. In this demo, virtual objects were augmented using fiducial markers and the detection is done through the AVRLib Library.