Guam Highway 12 (GH-12) is one of the primary automobile highways in the United States territory of Guam.

GH-12 is a short connector route that runs eastward from GH-2 through the northern part of residential Agat towards the Ordnance Annex Naval facility in Santa Rita.

At the entrance, GH-12 turns north and connects to GH-5 running north then west.

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