Ben Nevis the summit only to find "fragments of earthen and glass ware, chicken bones, corks, and bits of paper". It was not until 1847 that Ben Nevis was confirmed by the Ordnance Survey as the highest mountain in Britain and Ireland, ahead of its rival Ben Macdhui. The summit observatory was built in the summer of 1883, and would remain in operation for 21 years. The first path to the summit was built at the same time as the observatory and was designed to allow ponies to carry up supplies, with a maximum gradient of one in five. The opening of
British Isles being the highest point on the islands at . Other mountainous areas include Wales and parts of Ireland, although only seven peaks in these areas reach above . Lakes on the islands are generally not large, although Lough Neagh in Northern Ireland is an exception, covering . The largest freshwater body in Great Britain (by area) is Loch Lomond at , and Loch Ness, by volume whilst Loch Morar is the deepest freshwater body in the British Isles, with a maximum depth of . There are a number of major rivers within the British Isles. The longest is the Shannon