has 2D boundaryGo to external page http://purl.obolibrary.org/obo/RO_0002002
a relation between a material entity and a 2D immaterial entity (the boundary), in which the boundary delimits the material entity
Although the boundary is two-dimensional, it exists in three-dimensional space and thus has a 3D shape.
A 2D boundary may have holes and gaps, but it must be a single connected entity, not an aggregate of several disconnected parts.
my body has 2D boundary the surface of my skin