As it stands, this is a very short source text. Typical large Inform projects, though, run to 80,000 words or more - the length of a modern novel - and then it is not so easy to take in the situation at a glance.
The Kinds index is not geographical, but taxonomic: it breaks down the simulated world according to the nature of things. As can be seen, the world is basically divided into what physically exists, like Robert or Longman's shop, and what exists only abstractly, like the number 14.