The road measures 10.58 miles long and would take a car obeying speed limits 16 minutes to travel its length.
The B4358 is a B Road and is located in the Zone 4 Highways Region.
This is a true long-distance route, journeying through numerous towns like Beulah, Llanafanfawr, Llanfihangel Brynpabuan, Llysdinam, and Newbridge-on-Wye.
The road connects Powys and Powys.