The city is mostly flat or gentle hills and the land gently slopes upward away from the lake. The flat land is interrupted by the Toronto ravine system, which is cut by numerous creeks and rivers of the Toronto waterway system, most notably the Humber River in the west end and the Don River east of downtown at opposite ends of Toronto Harbour, and the Rouge River at the city's eastern limits. Most of the ravines and valley lands in Toronto today are parklands, and recreational trails are laid out along the ravines and valleys. The original town was laid out in a grid plan on the flat plain north of the harbour, and this plan was extended outwards as the city grew. The width and depth of several of the ravines and valleys are such that several grid streets such as Finch Avenue, Leslie Street, Lawrence Avenue, and St. Clair Avenue, terminate on one side of a ravine or valley and continue on the other side. Toronto has many bridges spanning the ravines. Large bridges such as the Prince Edward Viaduct were built to span wide river valleys.
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