Small islands. My wife caught some at (13,23), west of where one of those axebeak things was prowling. It never aggro'd on her. She did not mooch, used a crane fly. May have had Snagging on, she thinks.
Cat Became Hungry has reports on the matter, citing (14,14), (13,23), and (16,18), and includes one report that the spots, like the MIN/BTN nodes, change location.