Ro-Sinoe is one of Greelia's 16 counties and it has 17 districts. Beenville is the county's capital. As of the 2022 Census, it had a population of 150,358, making it one of the least populous counties in Greelia. Ro-Sinoe has the third-largest area of all Greelia's counties, it has the second least-dense population after Bloxpolu County.
The flag is a brown cross on a white background with the flag of Greelia in the top-left corner.