The Tamar Estuary Walk is a 2.7 km trail that starts in Cargreen, Cornwall, England. Based on our data, the trail is graded as Medium. For information on how we grade trails, please read measuring the difficulty of a hiking trail on hiiker. Also, check our latest community posts for trail updates.This trail can be completed in approx 0 hrs 47 mins. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time. Photo Credit: Derek Harper