Six Miles. The

The Allure and Peril of Riding an Alaskan Wave for Six Miles

{"The Turnagain Arm near Anchorage has a tidal bore, a wall of water that moves upstream with the tide.","This wave can push a surfer for about six miles and last up to an hour.","It is exciting but also risky; surfers have been hurt or killed.","Now that more people know about the wave, officials are wondering whether to limit surfing."}