A group of 16 gang members have been jailed for a total of 61 years for drugs offences in south-east England.
Eight people pleaded guilty to conspiracy to supply drugs and have been sentenced to between seven-and-a-half and three years in prison.
Two more have been handed a suspended sentence of two years for the same charge.
A further six gang members pleaded not guilty to supplying drugs, but were convicted and face between three and four-and-a-half years in prison.
Those convicted range in age between 18 and 27, with the exception of Geoffrey Allen who is 56 years old.
Met Police said between August and November last year the gang members ran five county lines in south-east England.
Senior members would manage the lines from London, while younger dealers would travel across the region to conduct sales.
The gang was also responsible for selling crack cocaine and heroin in South London.
Detective Inspector Anthony Jones said the convictions are the result of months of hard work.
“County lines remains a national issue, but as this investigation shows, we will work closely with colleagues from other forces to share intelligence, gather evidence and dismantle drug dealing networks,” he said.
“We are not complacent, and we will continue to identify and pursue those intent on participating in criminal activity.”