# BOUNDARY Command [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: This command is used to create closed regions or polylines. The [Boundary Creation dialog box](Help%20System/GSTARCAD/2027/Commands/03%20Dialog%20Boxes/Boundary%20Creation%20Dialog%20Box.md) is displayed. ## Command Access: > **Icon:**  > **Menu:** Draw > Boundary > **Ribbon:** Home > Draw > Boundary > **Toolbar:** / > **Command:** BOUNDARY > **Alias:** BO **Command Prompts: /** --- **Related References：** - [Commands about Linear Geometric Objects (GstarCAD 2026)](../../../2026/Commands/00%20Command%20Groups/Commands%20about%20Linear%20Geometric%20Objects.md) - [Commands about Regions and Areas (GstarCAD 2026)](../../../2026/Commands/00%20Command%20Groups/Commands%20about%20Regions%20and%20Areas.md) **Related Tasks：** - [To Work With Circles (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Circles.md) - [To Work With Ellipses (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Ellipses.md) - [To Work With Arcs (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Arcs.md) - [To Draw a Helix (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Draw%20a%20Helix.md) - [To Work With Splines (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Splines.md) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences/BOUNDARY.html) · © Gstarsoft Co., Ltd.