 Ohio State Route 7, a four-lane freeway, passes through the southeast side of the community, leading north (upriver) to Steubenville and south to Bridgeport, across the river from Wheeling, West Virginia.According to the 2010 census, the Brilliant CDP has a total area of , of which (or 98.87%) are land and (or 0.56%) are water.The climate in this area is characterized by relatively high temperatures and evenly distributed precipitation throughout the year.