# Boundary Creation Dialog Box [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [B](Help%20System/GSTARCAD/2027/Commands/B/(B).md) **Function Description:** 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.  **Dialog Box Options:** ## **Pick Points** Specifies one point in a closed region, the boundary can be determined by it. ## **Island detection** Controls the boundary type. The boundary can be created by regions or polylines. ## **Object Type** This closed boundary is called island. Specifies 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:** Defines the boundary set from everything in the current viewport extents. Current boundary set will be discarded when you select this option. - **New:** Prompts 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. --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_B/BOUNDARY_DIA.html) · © Gstarsoft Co., Ltd.