It is nine years since the beginning of the conflict in Syria.
On 15 March 2011, Syrian people took to the streets in anti-government protests.
The conflict has now become a tangled and complex war of regime militaries, rebels, jihadi forces and militias.
"The suffering of the Syrian people during this tragic and terrible decade still defies comprehension and belief", the United Nations Special Envoy for Syria, Geir Pedersen said in a statement on Saturday.
"Hundreds of thousands of Syrians, men and women, have lost their lives.
"Hundreds of thousands have been detained, abducted or are missing.
"Human rights abuses, crimes, destruction and destitution have taken place on a monumental scale."
384,000 people have lost their lives in the conflict - a third of which are believed to be civilians.
More than 11 million people have been displaced and turned into refugees either within Syria or abroad.
According to the UN Children's Fund (UNICEF), around 4.8 million children have been born in Syria since the conflict began.
While an additional one million children have been born as refugees in neighbouring countries.
"The war in Syria marks yet another shameful milestone today," UNICEF Executive Director Henrietta Fore said.
"As the conflict enters its 10th year, millions of children are entering their second decade of life surrounded by war, violence, death and displacement. The need for peace has never been more pressing."
Verified data from 2014, the year official monitoring began, until the end of 2019 revealed that more than 9,000 children were killed or injured in the Syrian conflict.
Nearly 5,000 children, some as young as seven years of age, are said to have been recruited into the fighting.
Cover image: Images of an airstrike allegedly carried out by Russian and Syrian forces in the Syrian town of Sarmin (Picture: PA).