Formation
The gorge carries the River Severn south towards the Bristol Channel. It was formed during the last ice age when the output from the previously north flowing river became trapped in a lake (Lake Lapworth) created when the Irish Sea ice sheet dammed the river. The level of the lake rose until it was able to flow over the hills to the south. This flow eroded a path through the hills forming the gorge and permanently diverting the Severn southwards.
Read more about this topic: Ironbridge Gorge
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