Blea Tarn is a lake in Cumbria, about half a mile north of Beckfoot.  At an elevation of 217 m (712 ft), the lake has an area of 3.3 hectares (8.2 acres) and measures 277 m × 150 m (909 ft × 492 ft), with a maximum depth of 11 m (36 ft).  (This is in case you’re planning your trip.)  Unused Photochrom Co. card with detailed instruction about what the postage should be.  Grade: 1