+-----+
|#4## |
|#   #|
| 2#3#|
|1# 0 |
+-----+
ISLAND COUNT = 5
ISLAND:  (0,0) (0,1)
ISLAND:  (2,0) (3,0)
ISLAND:  (4,1) (4,2)
ISLAND:  (2,2)
ISLAND:  (1,3)