<http://schema.org/description>
"A marathon is a grueling event that involves running for more than 26 miles. So, what makes a tough marathon? How about rocky terrain, steep inclines and extreme weather? Here&amp;#039;s a rundown of the world&amp;#039;s most punishing marathons."^^<http://www.w3.org/2001/XMLSchema#string>
<http://adventure.howstuffworks.com/outdoor-activities/running/events/toughest-marathons.htm>