They call her 'Nina' - but no one knows her name, her age or even what language she speaks.

The little girl, who is thought to be around three years old, has touched hearts in Croatia after she was found in a park in the town of Velika Gorica a month ago.

Authorities believe she may have become lost in the tide of people fleeing war-torn Syria for a better life in Western Europe.

But they admit they have no idea where she comes from or what language she speaks, and are hoping media attention will help reunite her with her family.

Croatia's Family Minister Milanka Opacic invited journalists and film crews to meet Nina at Zagreb's Child Care Centre to help find "anyone anywhere" who recognises her.

"So far we have no new information, we still can't figure out the language and country of origin of the child," she said.

"Today we decided to ask you, the media, to help find out her identity. The media can place her face in foreign media, due to your international co-operation".

"It's very important to us that anyone anywhere recognises her, so we can contact any members of her family".

More than 330,000 migrants have entered Croatia in the last two months. Many are parents with young children.