One of the activities in Vanuatu that gained the most attention on my instagram posts (@emmalucey) was visiting the Blue Holes. I was lucky enough to see two while we were on Espiritu Santo - Nanda and Riri Riri.
The Blue Holes are a natural creation, formed when springs of fresh water rise to the surface cutting through the limestone. Nanda is considered the most beautiful blue hole in Vanuatu and if you're looking for colour and clarity then I completely agree! You can see little schools of fish swimming around and diving down to the bottom. We took a canoe ride along a river to reach Riri Riri and I would also recommend this as the depth of the river changes as you paddle up to the blue hole - it's so interesting to watch the bottom as you go along through the forest.