Because the River Severn is a fressh water river. For any settlement to flourish it needs fresh water. Also the river would have been a source of food, ' fish etc.,
NB Because there is NO fresh water in deserts, settlements villages, towns, & cities do not naturally establish.
Modern technology allows places like Las Vegas to flourish because fresh water is piped in from hundreds of miles away.
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Chinese civilization originated in various regional centers along both the Yellow River and the Yangtze River valleys in the Neolithic era, but the Yellow River is said to be the Cradle of Chinese Civilization.
Along the coasts
Along the rivers.
Both are cities along the Chang Jiang River.
The Mississippi River