A rainbow that ends in the sea at Silloth

 

It was a good afternoon for rainbows with strong sunlight between showers. This one at Silloth ended in the sea, so with no boat, I had no chance of finding the treasure. However, it shows that the water has to be in droplet form to produce a rainbow. It is the boundary between the water and surrounding air that causes the refraction and total internal reflection combination. In the sea, there are no such boundaries so the rainbow ends at the sea's surface, even though it is water in the air that produces the rainbow.