Speaking from experience, searching online for interesting coastlines – that are actually useable – can be frustrating.
The Infinite Lands Heightmap Collection Pack includes a series of 20 procedurally generated heightmaps that offer more coastal detail compared to default Wonderdraft terrain. Each height map is 1024 pixels square; Wonderdraft imports and scales as required to fit your map’s dimensions. Terrain variations are infinite through overlaying heightmaps, including those generated by Wonderdraft. For even more variations, and to isolate that perfect peninsula, you can use your favorite graphic software to invert the heightmaps (to swap land with water). Pack also includes matching black/white land masks based on a default sea level.
This pack is licensed for commercial use.
Visit https://ko-fi.com/epsilon7430 for my free maps and to support my art.
A sample land mask from the collection (pack contains a matching heightmap with complete elevation range):