The Yemeni forces drove the Houthi militants out of the town of Lawder, their final stronghold in Abyan, retaking the fourth southern city in weeks, military sources said on Monday.
Warships and fighter jets from the Arab military coalition and the provincial popular resistance supported the forces during the battles in Abyan, they said.
Since mid-June, the government forces have regained control of the cities of Aden, Lahj and Dhali after months of deadly battles.
The final battle with the Houthi militants in the south is for Shabwa where locals said the militants have started to lose grip on areas they seized.
The sources said the victories in other cities have paved the way for the forces to besiege Shabwa and wage fierce battles against the militants expecting that Shabwa will be retaken very soon.
The gains by the government forces occurred with direct support from the coalition, which has recently launched the Golden Arrow Operation to restore power from the Houthis.
The operation was part of a recently revealed plan which included that the coalition backs the Yemeni forces to retake the south, middle regions and then the capital Sanaa.
The Houthi militants with support from forces and militias loyal to the former president ousted the government early this year triggering a civil war and the Saudi-led intervention in March.
In the meanwhile, the battles between the popular resistance fighters and the Houthis which broke out in Sanaa and Ibb in the past two days are continuing.
Local sources in the district of Arhab, north of Sanaa, said more than a dozen of Houthis were killed and others injured today in the battles as well as Arab airstrikes.
In Ibb, the popular resistance has driven the Houthis out of three more districts and it is expanding its operations to clean up the entire city from the Houthis, according to well-informed sources.