* Gallons are a unit of volume, measuring the amount of space a substance occupies.

* Meters are a unit of length, measuring the distance between two points.

To convert between volume and length, you need additional information.

For example, you could convert gallons to cubic meters, which is a unit of volume, or you could convert the volume of a container in gallons to the length of one of its sides in meters.

Let me know if you have more context and I can help you with the conversion!