The Limfjord (common Danish: "Limfjorden" , in north Jutlandish dialect: "Æ Limfjord") is a shallow part of the sea, located in Denmark where it has been regarded as a fjord ever since Viking times. However, it has inlets both from the North Sea and Kattegat, and hence separates the North Jutlandic Island (Danish: "Nørrejyske Ø", which includes the old provinces of "Vendsyssel", "Han herred" and "Thy") from the rest of the Jutland Peninsula. The Limfjord extends from Thyborøn Channel on the North Sea to Hals on the Kattegat. It is approximately 180 kilometres (111 miles) long and of an irregular shape with numerous bays, narrowings, and islands, most notably Mors, and the smaller ones Fur, Venø, Jegindø, Egholm and Livø. It is deepest at Hvalpsund (24 metres).