The 65th birthday of Aung San Suu Kyi, Burma's detained opposition leader, is being recognised by supporters both at home and abroad.
UN Secretary General Ban Ki-moon, US President Barack Obama and the UK have marked the occasion by reiterating calls for the Nobel laureate's release.
Members of Ms Suu Kyi's National League for Democracy plan to plant about 20,000 saplings around Burma.
Ms Suu Kyi has spent most of the last two decades in some form of detention.
Awarded the Nobel Peace Prize in 1991, she is one of the world's best known political prisoners, and is currently under house arrest in Burma's former capital, Rangoon.
Demonstrations calling for her release are planned around the world later on Saturday.
