区

1. Origins, structure, and basic meaning

• Structure: 区, read く, is an administrative ward or district.
• Basic usage: 三つの区に分ける makes wards the result of division; 区の図書館 links a library to its district.

2. Common pitfalls and similar expressions

• Division result and administrative affiliation
  • に分ける assigns the resulting units, while の marks jurisdictional affiliation; the term is administrative here.