There's a townland called "Stanalane" in Co. Antrim and of course the northern Bann runs through Co. Antrim, then Co. Derry, entering the sea beyond Coleraine. So this seems a strong possibility. I'll see if I can find it on the map. (And I thought I was going to have a lazy afternoon!)

"Castle Shore" could just be "castle shore", a local description rather than an actual placename.