Llanrhaeadr-ym-Mochnant topographic map

Average elevation: 289 m

Average elevation: 319 m

The town became a borough in 1203, with a charter permitting a weekly market and annual fair. The presence of two castles within a comparatively small town suggests that one (the earlier motte and bailey sited atop the town) went out of use before the establishment of the second (the motte with no bailey at…

Average elevation: 295 m

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Average elevation: 625 m

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Average elevation: 279 m

By the end of the 19th-century there were serious water shortages in the western parts of the historic county of Monmouthshire. The area had seen a massive population increase as a result of the steel and coal industries but the supply of water to the area was complicated due to its high altitude. A site for a…

Average elevation: 619 m

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Average elevation: 286 m

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Average elevation: 299 m

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Average elevation: 620 m

Average elevation: 297 m

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Average elevation: 206 m

The River Severn (Welsh: Afon Hafren, pronounced [ˈavɔn ˈhavrɛn]), at 220 miles (354 km) long, is the longest river in Great Britain. It is also the river with the most voluminous flow of water by far in all of England and Wales, with an average flow rate of 107 m3/s (3,800 cu ft/s) at Apperley,…

Average elevation: 92 m

Average elevation: 256 m

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Average elevation: 625 m

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Average elevation: 511 m

Average elevation: 187 m

Average elevation: 239 m