Sadly for a "sailor away from the sea" there are too few mountains in England, but the northern Dales and Pennines have some spectacular and rather lovely country especially along the shallow and fast flowing rivers.
Above the River Wear above Stanhope in Weardale, slow and lazy in the dry summer.
The falls at Richmond on the River Swale.
The Wear again at wolsingham.
High Force falls on the River Tees near Middleton in Teesdale, clearly Niagra they are not, but a 70 feet or so high they are powerful even in summer.
ICW Tugs May 2017* A
5 hours ago