History of Orkney should continue to be observed in Orkney and Shetland. Thus the udal succession and mode of land tenure (that is, absolute freehold as distinguished from feudal tenure) lingered to some extent, and the remaining udallers held their lands and passed them on without written title. The islands cluster round the huge deep-water anchorage of Scapa Flow like a protecting hand, and in both World War I and World War II, the Royal Navy had a major base there, enabling them to challenge any attempt by German warships to emerge into the ocean through the Norwegian Sea. After the Armistice in
Prehistoric Orkney Neolithic Orkney UNESCO World Heritage Site in the western part of the Orkney Mainland and which was inscribed in 1999. This small area has provided a rich archaeological heritage in a location that is relatively remote from both the main centres of population in Scotland and from more densely populated parts of Europe. However, it would be a mistake to imagine that because Orkney is so placed today that this was always so. There is a substantial amount of evidence that suggests that a variety of the smaller islands in the British Isles developed an advanced society in the Neolithic