Niantic has teamed up with the National Park Foundation to celebrate the 50th anniversary of the National Trails and National Wild & Scenic Rivers systems.

The National Trails and Wild & Scenic Rivers acts were established on October 2nd 1968 and are stewarded by a variety of federal, state and local agencies and nonprofit organizations.

Niantic is urging Pokemon Go players in the United States to visit nearby rivers and trails, either sending the developer a postcard of the trip or posting on Instagram with hashtags #ExploreWithNiantic and #FindYourWay.

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“Niantic and the National Park Foundation are exploring innovative ways to inspire people to connect with the national parks community using technology,” said the company on the campaign’s website.

“We are celebrating the 50th anniversary of the National Trails System and Wild & Scenic Rivers by encouraging everyone to visit a river or trail no matter where they are, and share their experience.”

Those who join in will receive a special patch and handwritten note from Niantic - those who send in postcards will also be awarded a postcard in return.

For every card Niantic receives - digitally or physically - the company will donate $5 to the National Park Foundation.

More information on the campaign, open only to players in the US, is available here.