The draw has been made for next season's new-look domestic 50-over competition.
The tournament - which does not have a sponsor yet - will replace the Yorkshire Bank 40 competition - won by Nottinghamshire this year - and will see two groups of nine teams.
Group A consists of Leicestershire, Northants, Yorkshire, Worcestershire, Derbyshire, Essex, Gloucestershire, Lancashire and Hampshire.
Group B has Middlesex, Durham, Nottinghamshire, Warwickshire, Surrey, Somerset, Kent, Sussex and Glamorgan.
Each team will play all the others in their group once, with four home games and four away. The top four in each group will go into the quarter-finals and it is a knockout from there.
The new structure means there is no place next year for Holland, Scotland or the Unicorns.
The Twenty20 tournament will also be re-structured, with two groups of nine - a north group and a south group.