Select Boundary Edge

Selects all connecting line segments comprising the outside boundary of a surface.

1. On the Home ribbon tab navigate to the Selection group. From the Select By drop-down list select Boundary Edge.

2. Click on a section of the boundary or edge of the surface of interest.
   All line segments comprising the boundary will be selected.

All line segments of a boundary are selected after clicking on a section of the boundary of the surface.

All line segments of a boundary selected after clicking on a section of the boundary of the surface.