Nobel peace laureate Adolfo Perez Esquivel and other Argentine human rights activists are visiting a Falklands Islands cemetery.
The trip come ahead of planned efforts by Argentina and Britain to identify the remains of 123 Argentine soldiers buried there after the 1982 conflict.
The two nations agreed last year to have a team of forensic experts from the International Committee of the Red Cross identify the remains.
Mr Esquivel, Nora Cortinas of the Mothers of Plaza de Mayo group and other activists visited Darwin Cemetery on Tuesday.
Argentina lost a brief but bloody war with Britain after Argentine troops invaded the South Atlantic archipelago.
Some islanders have expressed concern about the visit.
Argentina still claims the islands that it calls the Malvinas.
Britain says the Falklands are a self-governing entity under its protection.