The Titisee formed as glacial lake behind a glacial moraine. It was unearthed from a glacial moraine in the northern tundra. Leavenworth sits on the terminal moraine of that glacier. The lake, which drains to the north, formed behind a dam of glacial moraine. The lake formed behind the terminal moraine of a substage of that glacier. The dam can consist of glacier ice or a terminal moraine. The Kingston Flyer follows part of the former river bed now blocked by glacial moraine. It is the remains of a glacial moraine. Its thickness varies between a few meters at watersheds and 100 m at moraine ridges. The landscape is mostly flat though there is also some evidence of moraine and drumlins. Most contentious is the conflict use of the Oak Ridges Moraine. The Big Stone Moraine formed the southern boundary of the lake. Defiance lends its name to a distinct end moraine from the Wisconsian glaciation. It flowed over the top of a recessional moraine at Browns Valley. Most moraine dammed lakes drain quickly because water cuts entirely through the moraine.