How do i get my PS Channel to show in Layers?

[Dragonfyre]

I can’t tell if you have anything on your Coastline layer that would be causing the light spots around the coast, but assuming that’s not the problem, I’d go back a few steps and start again with your land layer (not the channel) and make a duplicate to play around with, ctrl + j. (replace ctrl with cmd if you’re on a mac)

1. Add a new fill layer with your main ocean color adjusment layers > solid color and move it to the background
2. On your land layer copy, go to layer effects > outer glow (looks like an fx near the trash can in the layers palette)
3. Change the glow color to your lighter/coastal ocean color. You can play around with the blending options for this if it suits your fancy.
4. Tinker with the range/size/spread options to get the look that you want. Switching the method from softer to precise may help you out, it makes a more exact outline, while the softer setting makes more of a vague shadow.

Note: This method will take out the vignette outline around the outside, if you want to add that back in, you can create a new layer and add an inner glow style to it.
Edit: That would need to be a blank layer filled with a solid color, then turn the fill (not opacity) down to zero.