The competition closed for entries on 14 December 2017 at 11.30 GMT.
Original and high-resolution files will be requested from 24 January until 9 February 2018 at 11.30 GMT.
Winners will be contacted by 16 March 2018.
There are three age group categories for photographers aged 17 and under.
Read the rules before entering the competition and submitting images.
Translations of young categories and rules
Available to download in 12 languages.
Frequently Asked Questions
Answers to the most common questions.