The Niagara Glen is a unique spot of beauty deep in the Great Gorge that has been a designated Nature Reserve since 1992. Stairways lead to 4 km (2.5 mi) of paths that wind through a pristine pocket of Carolinian Forest, past boulders left behind as the Falls eroded through the area thousands of years ago. Visitors should be aware that hikes through the Niagara Glen involve an elevation change of over 60 m (200 ft). Proper footwear suitable for steep and rugged terrain is required. The trails are well laid out and easily negotiated if you take your time! There's lots of interesting geology and biology to explore. Important Note -- the Niagara Glen is a Nature Reserve that contains wild flora and fauna (plants and animals). Please observe all posted regulations, stay on trails that are marked and follow generally accepted trail etiquette. Fires are not permitted. Take only photos, leave only footprints! The Niagara Glen overlooks the Niagara River Whirlpool, a unique natural phenomenon that you must see to believe! Thousands of years ago, as the Niagara River slowly eroded its way through the Niagara Escarpment, creating the Great Gorge, a right-angle turn in the river's path forced the rushing water into a deep counter-clockwise spin. The Niagara Glen is the most developed bouldering destination in Southern Ontario and is rightfully one of the best! Over seven hundred problems lie in the forest up river from the falls carefully tucked away from the insane tourists looming everywhere you look. The atmosphere is quiet the opposite, a beautiful setting with tons of high quality sandstone boulders with only climbers about.