The Bulgarian Third Amateur Football League, commonly referred to as "Third League" is the third level of the Bulgarian football league system. Third League operates on a system of promotion and relegation with the second and the fourth tier of the Bulgarian football league pyramid – respectively being Second League and the A Oblast Groups. Currently Third League consists of four divisions that are formed by separating the country into four regions: North-West, South-West, North-East and South-East. The divisions run in parallel during the season, but since the number of teams in each division may vary, the number of rounds in each of them may vary. Each team must play at least two times against every other team on a home-away basis.