# "Boundary Creation"Dialog Box [GstarCAD 2021](Help%20System/GSTARCAD/2021/Index.md) → [Commands](Help%20System/GSTARCAD/2021/Commands/(Commands).md) → [03 Dialog Boxes](Help%20System/GSTARCAD/2021/Commands/03%20Dialog%20Boxes/(Dialog%20Boxes).md) The Boundary Creation Dialog Box is used to define object type, boundary set, and island detection method when creating a region or polyline by specified points within a region enclosed by objects.  **Relative Glossary:** **Pick Points:** Specify one point in a closed region, the boundary could be determined by it. **Island detection:**Control the boundary type. The boundary could be created by regions or polylines. **Object Type:** This closed boundary is called island.Specify the type of the new boundary object. BOUNDARY command creates the boundary as a region or a polyline object. **Boundary Set:**When specifying the boundary by a point, the boundary set is a set of objects which need to be analyzed. > **Current Viewport:** > Define the boundary set from everything in the current viewport extents. Current boundary set will be discarded when you select this option. **New:** > Prompt you to select the objects that define the boundary set. Only the objects, that can be used to create a region or closed polyline, can be selected to construct the new boundary set. Some related detail about those options reference to HATCH. ## Other versions with matching text [GstarCAD 2016](../../../2016/Commands/03%20Dialog%20Boxes/Boundary%20Creation-Dialog%20Box.md) · [GstarCAD 2017](../../../2017/Commands/03%20Dialog%20Boxes/Boundary%20Creation-Dialog%20Box.md) · [GstarCAD 2018](Help%20System/GSTARCAD/2018/Commands/03%20Dialog%20Boxes/Boundary%20Creation-Dialog%20Box.md) · [GstarCAD 2019](Help%20System/GSTARCAD/2019/Commands/03%20Dialog%20Boxes/Boundary%20Creation-Dialog%20Box.md) · [GstarCAD 2020](Help%20System/GSTARCAD/2020/Commands/03%20Dialog%20Boxes/Boundary%20Creation-Dialog%20Box.md)