A monument is defined as which of the following? Specifically, a concrete object permanently set in the ground to mark the position of a point or boundary corner.

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Understanding what makes a monument different from other survey marks is about the purpose and permanence. A monument is the concrete object permanently set in the ground that marks the position of a point or boundary corner. It serves as a durable, tangible reference that surveyors can relocate in the future to reestablish a point on the ground.

A benchmark, by contrast, is a mark used to determine elevations relative to a datum, focusing on vertical position rather than marking a boundary corner. A reference point is any point used as a reference, not necessarily a permanent physical marker. A control point is a point with known coordinates used to control surveys and the network’s geometry; it defines the network’s framework more than being the physical marker itself.

So the description aligns with a monument—the concrete, permanent marker placed to indicate a specific point or boundary corner.