# HPISLANDDETECTIONMODE [GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [System Variables](Help%20System/GSTARCAD/2027/System%20Variables/(System%20Variables).md) **Function Description:** The HPISLANDDETECTIONMODE system variable is used to control whether to detect internal closed boundary(named island). | | | | --- | --- | | Type | Integer | | Saved in | Not saved | | Initial value | 1 | | Range | 0,1 | **System Variable Value:** **0:**off **1:** on(recommended) --- [Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/systemVariables/HPISLANDDETECTIONMODE.html) · © Gstarsoft Co., Ltd.