An international convention that bans landmines was signed in Mozambique in 1999.
Today, 15 years later, delegates are back in the country, this time to see what difference the ban has made, and what more must be done.
A lot of progress has been made. Now mines are rarely used in conflicts, and even countries that haven't signed up - abide by most of its rules.
Al Jazeera's Tania Page reports from Maputo.