Israeli Prime Minister Benjamin Netanyahu has described Israeli forces' capture of Beaufort castle in southern Lebanon as a "dramatic shift" in Israel's war on Lebanon.

"Today, we have returned to Beaufort in a different way. We have returned united, determined, and stronger than ever," Netanyahu said in a video statement.

"The capture of Beaufort is a dramatic stage and a dramatic shift in the policy we are leading. We have broken the barrier of fear. We are taking the initiative, we are operating on all fronts – in Syria, in Gaza, in Lebanon."

The capture of the medieval castle and ridge deepens Israeli footprint in the country beyond the demarcation zone known as the "Yellow Line", which it established in April following the ceasefire.

Beaufort Castle, known in Arabic as Qalaat al-Shaqif, is a strategic vantage point overlooking large parts of southern Lebanon and northern Israel. It is located about 5km from the major southern city of Nabatieh.