Loma is northeast of Fort Benton where the Marias joins the Missouri River. Cross the Missouri River by ferry upriver at Carter or down-river at Virgelle; both ferries operate from March through October. One mile south of Loma, in June 1805, is where the Lewis and Clark Expedition spent nine days at the Marias River deciding which fork would lead them to the Northwest Passage. The "Decision Point" marker on the Lewis and Clark National Historic Trail is where they determined the Marias was not the main stem of the Missouri. A visit to the landmark will reward you with a beautiful overlook of the confluence of the Marias and Missouri Rivers.