20 stunning photos of unreal landscapes, incredible animals, and mesmerizing underwater scenes

This week National Geographic announced the winners of their annual Nature Photographer of the Year Contest.

Judges chose winners and honorable mentions from 11,000 entries. The four different catagories included: aerials, landscapes, wildlife, and underwater - and a people's choice award was also announced within each.

The grand-prize winning photo of an orangutan crossing a river, taken by Jayaprakash Joghee Bojan, was awarded $10,000, and will be printed in an upcoming issue of National Geographic magazine. Below, see the stunning photos.

Captions provided by National Geographic.