Alderney ( / ɔː the d ər n i / ; French : Aurigny [oʁiɲi] ; Auregnais dialect : Aoeur’gny ) is the northernmost of the inhabited Channel Islands . It is part of the Bailiwick of Guernsey , a British Crown dependency . It is 3 miles (5 km) long and 1 1 / 2 miles (2.4 km) wide. The area is 3 square miles (8 km 2), making it the third-largest island of the Channel Islands, and the second largest in the Bailiwick. It is around 10 miles (15 km) from the west of The Hague on the Cotentin Peninsula , Normandy , France, 20 miles (30 km) from the north-east of Guernsey and 60 miles (100 km) from the south coast Great Britain. It is the closest of the Channel Islands to both France and the United Kingdom. It is separated from Hague Cape by the dangerous Alderney Race (English: Raz Blanchard ).
Guernsey ( / ɡ ɜːr n z i / ) is an island in the English Channel off the coast of Normandy . It lies roughly north of St Malo and the west of the Cotentin Peninsula . With several smaller local islands, it forms a jurisdiction within the Bailiwick of Guernsey , a Crown dependency . The jurisdiction is made up of ten parishes on the island of Guernsey, three other inhabited islands ( Herm , Jethou and Lihou), and many small islets and rocks. The jurisdiction is not part of the United Kingdom . 
Jersey ( / dʒ ɜːr z i / , French: [ʒɛʁzɛ] ; Jèrriais : JERRI dʒɛri ) Officially the Bailiwick of Jersey ( French : Bailliage Jersey ; Jèrriais : Bailiwick Jerri ) is a Crown dependency  Located near the coast of Normandy , France .  Jersey was part of the Duchy of Normandy, whose dukes went on to become kings of England from 1066. After Normandy was lost by the kings of England in the 13th century, and the ducal title surrendered to France, Jersey and the other Channel Islands remained attached to the English crown.