The 2011 National Geographic Traveler Photo Contest is now underway, and we’ve already received some great submissions, like this photo from Patrice Carlton that captures her up-close-and-personal encounter with a tiger in Chiang Mai, Thailand.

From April 5 to July 11 submit digital entries online in any of these four categories:

Travel Portraits: Locals working, playing, celebrating

Outdoor Scenes: Landscapes, aerials, wildlife, waterscapes

Sense of Place: Pictures that evoke the essence of a place

Spontaneous Moments: Fun, quirky, surprising, and unrehearsed moments

Winning images will be showcased in the November/December 2011 issue of National Geographic Traveler magazine. You’ll also have a chance at winning one of our amazing prizes.

Need a little inspiration? Check out the gallery of photos from last year’s winners and follow @NatGeoTraveler on Twitter today from 3:30-5:00pm EST as we tweet travel photography tips during Travelers’ Night In.

Photo: Patrice Carlton, 2011 Traveler Photo Contest entry.