When the boundary line follows the direction of irregular rice land dikes, monuments should be placed at corners within what average interval (from monument to monument)?

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When a boundary line runs along irregular features like rice land dikes, you need markers at regular intervals so the line can be re-established on the ground even where the feature bends or is obscured. Monuments serve as reference points at corners and at consistent distances along the line to keep the boundary traceable.

Twenty-five meters is the typical spacing because it balances practicality and reliability: there are enough markers to reoccupy and verify the line without making the survey too costly or cluttered with monuments. If markers were placed much closer, the effort and expense would rise without a proportional gain in accuracy; if they were spaced much farther apart, the line could become difficult to locate between markers, especially along a meandering boundary.