@alandor said: ........But even though my lines are planar and connected they don't seem to seperate this area from the rest of the face. If I delete and redraw one of the lines between the road and the innermost area I get a surface only on the innermost area and not on the actual roads....... Does anyone recognize this problem and know of a way to solve it?.... Yes, I do recognize the problem. It's a known issue that you can duplicate any time. So even the 'Drape' tool can be fooled by it. What happens is this: Draw a face. Draw another face on top of the first one. The second one has its bounding edges entirely within the larger first one. However, they both share only one vertex. The smaller face and the larger one don't merge/melt into two separate faces. Most likely your draped lines created an inner face connected with only one vertext on the larger face boundary. %(#FF0000)[Remedy(don't retrace any edge!!!): draw a connecting edge between both boundaries. Next delete that edge again.]