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LevelDesigner.net

Ho·ri·zon - The line or circle that forms the apparent boundary between earth and sky.
Dictionary.com

Imagine looking so far into the sunset you can barely see the island in the distance where your ships head out to. This was how I first thought of Horizon. Healthy development tends to morph concepts. Forced to fit in the smaller 16Km region size made sense, who wants to wait a week for shipments anyway.