To find the perimeter of a regular octagon, you can use the formula:
\[ \text{Perimeter} = \text{Number of sides} \times \text{Length of one side} \]
A regular octagon has 8 sides. Given that the length of each side is 3 meters, the calculation would be:
\[ \text{Perimeter} = 8 \times 3 , \text{meters} \]
Calculating this gives:
\[ \text{Perimeter} = 24 , \text{meters} \]
Thus, the perimeter of the octagon is \( \boxed{24} \) meters.