What is the tidal range in Bristol channel?

The tidal range in the Bristol Channel is one of the highest in the world, with a maximum range of 14.5 metres (48 feet) between high and low tide. This is due to the shape of the channel, which is funnel-shaped and narrows towards the head of the channel. The narrowing of the channel causes the tidal wave to become compressed and amplified, resulting in the high tidal range.