are the  Thames ,  Severn  and the  Humber . England's highest mountain is  Scafell Pike  (978 metres (3,209 ft)) in the  Lake District . Its principal  rivers  are the Severn, Thames, Humber, Tees, Tyne, Tweed, Avon, Exe and Mersey. [99] Ben Nevis , in Scotland, is the highest point in the  British