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jumping platform
A Jumping platform is a naturally occurring or human-made surface for people to jump from. It is usually situated above sufficiently deep water, or above mats, a box-spring mattress, piles of empty cardboard boxes, or other soft landing surfaces, or they may be used together with other means of dampening the impact (such as for example, platforms for bungee jumping). Children often improvise platforms, either on a large scale (at abandoned quarries) or on a smaller scale (e.g. by moving a desk next to a bed, to jump onto the bed from the desk).
==Platforms for cliff jumping==
For cliff jumping, the platform is usually a simple clearing in the bushes and other vegetation along the cliff above a river, ocean, lake, or quarry.
Sometimes railway bridges and other bridges are used as platforms. They can sometimes be distances up to approximately 30 metres (100 feet) above the water.
Abandoned quarries, and deep ponds will often have platforms, whether by design, or by improvisation of the people in the community. For example, platforms will often be affixed to towers in abandoned rail yards, overlooking a deep pond.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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