This is our top-level category; using another metaphor, it's our root category.
Every other category should be a subcategory of at least one category; and every article should be in at least one category but will often be suitable for two or more.
If two categories have overlapping subject-matter with each having some that's not in the other (eg New Zealand and Tasman Sea or Palmerston North and Manawatu River), they can each include (in the text portion) a link to the other, but neither should be a subcategory of the other. We will use the project:categorisation page for detailed reasons and recommendations, including ways of arranging articles and subcategories in other than strict alphabetical order.
This category has the following 13 subcategories, out of 13 total.