Le Drian travelled from Chad to Madama, a desert outpost about 100 kilometres from Libya, where he saw in the New Year with troops at a French base.
Madama is situated on the route used by jihadists and arms smugglers in southern Libya to reach northern Mali and Niger.
Le Drian said his visit demonstrated France's "determination... Against the jihadists, terrorism and those who want to transform this ancient caravan route into a route of violence and trafficking".
Three years after dictator Moamer Kadhafi was toppled and killed in a NATO-backed revolt, Libya is awash with weapons and powerful militias, and run by rival governments and parliaments.
Questioned about the possibility of another military intervention in Libya, as some neighbours including Chad are calling for, Le Drian insisted on the need for a political solution.
"We first have to find a global roadmap on Libya," he said.
The French military in 2013 routed radical Islamist groups from large swathes of northern Mali. Then in August last year, the Malian operation gave way to a wider, regional counter-terrorism drive dubbed Operation Barkhane.
A total of 3,000 troops are deployed across Burkina Faso, Chad, Mali, Mauritania and Niger to track and combat Islamist militants, backed by fighter aircraft, helicopters and drones.
In October, French soldiers in northern Niger intercepted a convoy of vehicles carrying three tonnes of weapons destined for Mali, including Russian shoulder-fired missiles and several hundred anti-tank rockets.
Yesterday, a camp used by Malian, French and UN forces in the remote northeastern town of Tessalit near Algeria came under attack for a second time this week, a French military source said.
Yesterday also saw clashes between armed groups around the historic town of Timbuktu, an African military source in northern Mali told AFP. The situation in the area was still tense today, the source said.
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