珊瑚礁

1. Origins, structure, and basic meaning

• Structure: 珊瑚礁 (さんごしょう) is a compound noun for an ecological formation built from coral skeletons in shallow warm seas.
• Basic usage: 浅い海の珊瑚礁を眺める makes the marine formation the object viewed from a boat, while 珊瑚礁には生き物が集まる makes it the habitat where diverse organisms gather.

2. Common pitfalls and similar expressions

• Marine formation and habitat
  • 珊瑚礁を眺める views the whole formation, whereas 珊瑚礁には introduces its ecological role. The term is broader than one coral organism.