As the cache name suggests this is Nano and it is near the bridge not on it. BYOP
The size of the cache was chosen because of the name of the Education Pioneer and Cork Legend Honora Nagle (c. 1718 – 1784), known by her informal name as 'Nano' Nagle.
If you are a visitor to Cork you might like to learn more about Nano Nagle at the nearby Musem at Nano Nagle Place (51.893919, -8.473122)