Mariana Trench in the western Pacific. The trench is some miles long (about km), with an average width of only 43 miles km). Image via Wallace at Wikimedia Commons. The Challenge Deep, the Mariana Trench is almost 7 miles deep
The Brain Tumour Charity is the UK’s largest dedicated brain tumour charity. We fund scientific and clinical research into brain tumours and provide support and information to those affected, whilst raising awareness and influencing policy.