There are only a few days left to enter National Geographic's annual travel photography competition – entries close on 27 May 2016. Photographers can submit entries in any or all of three categories: Nature, People and Cities. The grand prize award winner will receive a seven-day polar bear photo safari for two at Churchill Wild–Seal River Heritage Lodge in Canada.

IBTimes UK presents a tiny selection of the thousands of photos submitted so far. See more – and enter your own pictures – on the National Geographic website.

National Geographic Travel Photographer of the Year Contest
...But I am not the only one, by Yuval Ofek. Location: Near Serengeti National Park, Tanzania, Africa. 'A lone zebra in the midst of a field full of flowers'Yuval Ofek/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Mystical Forest, by Tracey Jennings. Location: Simon's Town, Western Cape, South Africa. 'You don't need to travel far from cities to visit Narnia. This seven-gill shark was photographed in a kelp forest just off the shore of Simon's Town near Cape Town'Tracey Jennings/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
The blue city, by Mike Czech. Location: Jodhpur, Rajasthan, IndiaMike Czech/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Time To Go Home, by David Nam Lip. Location: Tongi train station, BangladeshDavid Nam Lip Lee/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Blue Lagoon, by Slawek Kozdras. Location: Blue Lagoon, Iceland. 'People enjoying their time in the legendary Blue Lagoon outside of Reykjavik in Iceland'Slawek Kozdras/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Midnight Thirst, by Alison Langevad. Location: South Africa . 'In the still of a starlit night, buffalo cautiously approach to quench their thirst. A long exposure with light painting allows me to capture the moment forever'Alison Langevad/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
The wall of icons, by Romaine W. Location: Havana, Ciudad de La Habana, Cuba. 'As I was walking through the streets of Havana I came across this house that looked more like a museum than a regular home. As Cubans are always welcoming to guests I decided to take a peek inside, only to find out that this was actually a home containing collectible items from vinyl records to a large scale American flag, then to this wall of icons; decorated with a Cuban flag, revolutionary fighters, and past and present Cuban leaders'Romaine W/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Gentle Giants, by Kathleen Cameron. Location: Plettenberg Bay, Western Cape, South Africa. 'Elephants hold on to each other's tails as they walk the fields of The Crags Elephant Sanctuary'Kathleen Cameron/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Colourful market in Bangkok, Thailand, by Kajan MadrasmailKajan Madrasmail/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
San Francisco from 5,000ft above the bay, by Joe Murphy. Location: Alameda Point, California, US. 'Taken on a clear day from the air. I was lucky enough to have my camera with me, and the weather was right for the shot. You can see the Bay Bridge in the foreground and the Golden Gate in the background'Joe Murphy/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
First Light - Two Medicine Lake, by Manish Mamtani. Location: Two Medicine Lake, Glacier National Park, Montana. 'We drove early morning from St Mary's Lodge to see the sunrise at Two Medicine lake in Glacier National Park. There were no clouds but the lake water was so calm, it created a perfect reflection of the red light kissing the Sinopah Mountain. As there was no wind in the morning, the colourful stones in the foreground were visible'Manish Mamtani/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Snowy bride, by Stephane Mangin. Location: Shinjuku, Tokyo, Japan. 'Brave bride getting wed in the only day of snow in Tokyo, winter 2014'Stephane Mangin/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Golden sunrise, by Giovanni Modesti. Location: San Quirico d'Orcia, Tuscany, ItalyGiovanni Modesti/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Holi festival, by Claudio Ceriali. Location: Mathura and Vrindavan, India. 'Holi, the festival of colours, is an ancient Hindu tradition that is celebrated around the world, with the biggest and most colourful gathering taking place in the twin cities of Mathura and Vrindavan in India. The unifying festival is a celebration of love and the arrival of spring and includes the singing of folk songs and traditional dances depicting the festival’s origins'Claudio Ceriali/National Geographic Travel Photographer of the Year Contest
National Geographic Travel Photographer of the Year Contest
Rain in the Desert, by Stefan Forster. Location: NamibRand Park, Namibia. 'Over the last seven years I had one aim: to photograph rain in the driest desert of Africa. In 2015 finally I found the rain. In the breathtaking scenery of the Namibrand-Park, an enormous thunderstorm came in and the setting sun created a wonderful rainbow. The challenge was to not have my shadow in the picture'Stefan Forster/National Geographic Travel Photographer of the Year Contest