Well I have learned a lot about layers and many thanks to all of you for your help. Still a lot left to do on this one but time to put it aside for today. I live near the Canadian Rockies and there are a lot of upper mountain lakes in and around Canmore and Banff so this is what I was trying to achieve. I tried to add a shoreline layer but had a weird problem come up. I created a new layer and then saved the file but when I rendered the file the changes didn't occur. So I opened the material editor and sure enough the shoreline layer was there but the settings didn't save. I tried it 4-5 times but it won't save the settings for the layer. I think it may be a memory problem, but was wondering if any of you had any similar problems. Thanks