广大 guǎngdà vast or extensive
(of an area) vast or extensive; large-scale; widespread; (of people) numerous
How to remember 广大: 广 broad + 大 big = vast or extensive.
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How it is used
- "Vast" for areas, and "the broad masses of" people: 广大地区 (guǎngdà dìqū) vast regions; 广大群众 the broad public.
- The "numerous people" sense is a fixed political/formal collocation: 广大人民群众.
- Register is formal/official; not used for a single large object.