I don't know the current position, but when I visited Corfu on holiday in my teens (so we're talking around 20 years ago) Corfu Airport had the reputation of being the most dangerous airport in Europe. Why, well it only has one runway and it is mostly over water...
The approach is flying along side the island over water so if you look out one side of the plane, nothing, the other, the lights of Corfu Town. A steep banked turn to line up with the runway and in. Apparently lots of planes have missed or skidded into the water in the past. Anyway, here is the best pic's I can find with zero effort
The barrier across the water at the foot of the runway is a causeway you can walk across the bay (which I've done). The very small island is the famous "Mouse Island".