This deck of 48 Knowledge Cards invites you to determine a location on the basis of certain clues. A clue--for example, "Suddenly, all is calm after days of rafting on thick, red water through furious rapids in Arizona's high desert. Where in the World Are You?"--appears on one side of each card. The opposite side answers the question and furnishes notes and observations on such topics as the location's geological formation, ecology, and features. The cards' content is as diverse as their subjects, but all yield solid information, dry humor, and fine entertainment for the agile of mind. Whether you're a seasoned world traveller or embarking on your first big backcountry adventure, these cards will provide puzzlement and pleasure on the trip to the trailhead.

A portion of the proceeds from the sale of these cards supports the Sierra Club's efforts to preserve and protect the planet.