The Blackwater Estuary is a 23.5 km trail that starts in Maldon, Essex, 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 6 hrs 8 mins. Caution is advised on trail times as this depends on multiple variables. For more info read about how we calculate hike time.Photo credits : Roger Jones