It was an English limited overs county cricket tournament which was held between 4 May and 29 August 1999.
[1] The tournament was won by Gloucestershire who defeated Somerset by 50 runs in the final at Lord's.
In a major change to previous tournaments, 17 amateur teams, representing the cricket boards of every first-class county except Glamorgan, were added to the competition.
The Ireland, Scotland and Netherlands teams also participated, as in previous years, while Denmark made its debut in the tournament.
The tournament retained its knockout format, but now with four rounds before the quarter-final and semi-final stages.