The lake's name comes from Mazinaabikinigan-zaaga'igan, meaning "painted-image lake" in Algonkian, referring to the pictographs on Mazinaw Rock which overlooks the lake. Mazinaw Lake is in the Addington Highlands just north of Kaladar. Mazinaw Lake is situated on the upper end of the Mississippi River. It's about 15 km (9 mi) long and averages a bit over 1 km (0.6 mi) in width. The average depth 41 m (135 ft) with a maximum depth of 145 m (476 ft), making it the second deepest lake in Southern Ontario besides the Great Lakes. It is divided into North and South sections of the lake by a narrows, North Mazinaw being the larger and deeper. The spectacular scenery standing on a 1.5 km long sheer cliff ,100 meters (325 feet) above the deep dark water of Mazinaw Lake is amazing. What's even more amazing is the sheerness of the cliff continues down below the surface of the water for another 100 meters (325 feet). This unbelievable huge cliff is painted with Native hieroglyphics. Bon Echo Provincial Park encompasses the central section of the lake, including the narrows between North and South Mazinaw, as well as Mazinaw Rock. A dam is located at the outflow of the lake to control water flow in the spring.Mazinaw Lake is the second-deepest lake in Ontario and features over 260 native pictographs often confused with petro glyphs. It has the largest visible collection in Canada including the Ojibwa trickster figure and culture hero, Nana bush. The rock also contains a tribute to Walt Whitman, inscribed for Flora MacDonald Denison, who ran the Bon Echo Inn on the site of the provincial park during the 1910s. Surprisingly mink can be spotted roaming the northern shores of the lake.