
Autumn tree colours Bristol Harbour
The gorge, which helped protect Bristol Harbour, has been quarried for stone to build the city, and its surrounding land has been protected from development as The Downs and Leigh Woods. The Avon estuary and the gorge are the county boundary with North Somerset, and the river flows into the Severn Estuary at Avonmouth . Another gorge, cut by the Hazel Brook (which flows into the River Trym ), crosses the Blaise Castle estate in northern Bristol.