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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
You can also try working with a heightmap of a real world location using https://heightmap.skydark.pl/ Set the water depth to 60 if you want shellfish/tuna. Check the max height in your selected area doesn't exceed the max height in game (1024m) including ocean depth. Use the height scale to bring it down, you may want to do this anyways if you like more flat areas. Then download the image file and import into the map editor. You may need to repeat this process a few times to get it right. It will need a lot of smoothing but can quickly produce much of the landscape. Then set your water level, put in forests and resources, highways and other networks.