> ## Documentation Index
> Fetch the complete documentation index at: https://shapely.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Shapely BuildBoundary

>  This creates a geometry that defines the surrounding area. This operation defines the area covered by the geometry.

**All lines belonging to the geometry are stored within the method.**


<Note>
  I recommend working with polygons for the best results!

  Interior lines(holes) are not lost; they are simply not displayed in the method result. Use the Shapely.PerimeterInterior method to retrieve interior lines(holes)!
</Note>

### An example of transformations

<a href="/images/Shp_BuildBoundary.png" target="_blank">
  <img src="https://mintcdn.com/shapely/Zmixl7owj_j1fwHG/images/Shp_BuildBoundary.png?fit=max&auto=format&n=Zmixl7owj_j1fwHG&q=85&s=1ac11b20f110a2b659404f8471e758b2" className="pointer-events-none" style={{ borderRadius: '0.5rem', border: '1px solid rgba(0,0,0,0.1)' }} width="1879" height="784" data-path="images/Shp_BuildBoundary.png" />
</a>