I am trying to make a depth map of a lake. I am using the contour plugin to generate contour lines. The problem I am having is that when I use the plugin the contours come out right except on the north side of the lake. They do not follow the outline of the lake on that side. I am not sure how to go about making the contours only show up inside of the lake. I have added a few screenshots of what I have. Thanks for any advice that can be given. I am not a master GIS user. I am a fisheries biologist learning to use GIS.
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