The point of observation on Kauai is only 100 feet above sea level. Oahu is 90 miles from Kauai which seems too far away. Locals have said that sometimes they are able to see Oahu from this point on Kauai. How can that be?

1. It is not possible… I lived on Oahu for most of my life (20 years).. and I could never see Kauai.. so I dont think the opposite is true.. But there are islands that you can see other islands from.. just not those two..
2. I'm not sure but I do know that on flat ground you can only see 7 miles before the curvature of the earth interfears.

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