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This is a paid asset, but now you can download Infinite Terrain Brush Pack Free.
Detail this asset from Unity Store: Original Link
Infinite Terrain Brush Pack v1.0
Infinite Terrain Brush Pack with 60 different brushes, that you can create your terrain. The brushes from natural mountains, underwater sand other terrain details that your terrain will be very similar as the natural terrains – hills. This tool is big help for the fast terrain creation, because all brushes include natural shapes. This package does not include the water! Features:
– 60 different brushes.
– all brushes for natural sources for the natural view.