AMMAN, Sept 26 (Reuters) - Syria said on Monday that 29 people had died of cholera in what the United Nations has called the worst outbreak of the disease in the war-torn country for years.

Rapid assessment testing has confirmed 338 cases since the outbreak was first recorded last month, Syria's health ministry said in a statement, with the bulk of the deaths and cases in the northern Aleppo province.

It said 230 cases were in Aleppo province, where 25 people were confirmed dead. The rest were spread across Syria.

The U.N. said this month the outbreak was believed to be linked to irrigation of crops using contaminated water and people drinking unsafe water from the Euphrates river which bisects Syria from the north to the east

he highly contagious disease has also spread to the country's Kurdish-held and opposition areas in north and northwestern Syria, where millions have been displaced by the decade-long conflict, medical officials said.