|Overall winner: “The striking landscape of the Kgalagadi Transfrontier Park during sunrise. This south African park is characterized by vast arid landscapes with red dunes, sparse vegetation and camel thorn trees.” Attribution: Davide Gaglio. CC BY|
This is just a small selection of the images published this year, in total there were 26 images, all licensed under a CC BY attribution licence, so they are free to reuse, copy and distribute.
The Editorial complete with all images can be found here: 10.1186/s12898-016-0090-z