Thousands of people from all over the world come to the Bosnian town every year and follow the same forest path used by the Bosniaks when they were fleeing genocide.
The campaign lasts three days, culminating in the participants' arrival in Potocari.
More than 8,000 Bosnian Muslim men and boys were killed when Bosnian Serb forces attacked the eastern town of Srebrenica in July 1995, despite the presence of Dutch peacekeeping troops.
The Serb forces were trying to wrest territory from Bosnian Muslims and Croats to form a state.
The UN Security Council had declared Srebrenica a "safe area" in the spring of 1993. However, troops led by Gen. Ratko Mladic, who was later found guilty of war crimes, and crimes against humanity and genocide, overran the UN zone.
Dutch troops failed to act as Serb forces occupied the area, killing some 2,000 men and boys on July 11 alone.
Around 15,000 residents of Srebrenica fled to the surrounding mountains, but Serb troops hunted down and killed 6,000 more people.
The bodies of victims have been found from 570 places across the country.
In 2007, the International Court of Justice in The Hague ruled that genocide had been committed in Srebrenica.
On June 8, 2021, UN tribunal judges upheld in a second-instance trial a verdict sentencing Mladic to life in prison for the genocide, persecution, crimes against humanity, extermination and other war crimes in Bosnia-Herzegovina.
