667 663
2. What is the height of Pen yr Ole Wen to the west of Cwm Lloer? (1)
978m
3. What geographical feature is Cwm Lloer? (1)
Cmw Loer is a corrie or cirque
4. How many metres from east to west is Llyn Ogwen? (1)
1,550m (accept 1,500m - 1,600m)
5. What is the widest part of Llyn Ogwen in metres? (1)
365m (350-375m)
6. What is the six-figure grid reference of the Idwal Cottage Youth Hostel? (1)
648 603
7. At approximately what height above sea level is Llyn Ogwen found? (1)
380m
8. How wide is the flat valley floor of the Nant Ffrancon at the stepping stones found at GR 642 615? (1)
400m
9. With reference to the OS map, describe the long-profile of the Afon Ogwen from its source to the stepping stones at GR 642 615. (6)
The Afon Ogwen has its source at grid reference 667 663 at around 750 metres above sea level. The river falls rapidly in height over its first 500 metres to reach the Ffynon Loer tarn at 600m above sea level. The Afon Ogwen then falls another 300 meters to reach Llyn Ogwen.
On leaving Llyn Ogwen the river tumbles 100 metres down the Ogwen falls to the head of the Nant Ffrancon valley. Once on the floor of the Nant Ffrancon the river falls less than 10 metres over the next 1,500m before reaching the stepping stones at GR 642 615, 5.5 km from the source.
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