Two neighboring properties. A shed near the boundary. The question is not simply where the fence or hedge appears to be. The question is where the actual property line lies. Look at this simplified plan. The dashed line represents the boundary. Part of the shed extends across it, into the neighboring lot. That physical intrusion is an encroachment. Compare it with an easement. An easement is a legal right to use another's land. An encroachment describes something physically crossing a boundary. One does not automatically create the other or transfer ownership. A survey can help locate the intrusion; documents and applicable law help determine the rights. Quick check: a shed crosses the property line. What describes the physical condition? Encroachment.