Scottish Munros

So here goes the first week I'm tackling TidyTuesday. The dataset this week is on Scottish geography. To quote the readme:

A Munro is a Scottish mountain with an elevation of over 3,000 feet, whereas a Munro Top is a subsidiary summit of a Munro that also exceeds 3,000 feet in height but is not considered a distinct mountain in its own right. The most famous Munro is Ben Nevis.

In 1891, Sir Hugh Munro produced the first list of these hills. However, unlike other classification schemes in Scotland which require a peak to have a prominence of at least 500 feet for inclusion, the Munros lack a rigid set of criteria for inclusion. And so, re-surveying can lead to changes in which peaks are included on the list.

Of the 604 peaks in the data, 282 are currently classified as Munros; of those, 251 were counted on the original 1891 list.