早瀬

1. Origins, structure, and basic meaning

• Structure: 早瀬 (はやせ) is a geographical noun for a shallow stretch of river with a swift current.
• Basic usage: 岩の多い早瀬を下る treats the rapids as the boat’s route, while 川の早瀬で水しぶきが上がる treats them as the place where spray rises.

2. Common pitfalls and similar expressions

• Route を and location で
  • In 早瀬を下る, を marks the route traversed rather than an object being altered. A place where an event occurs is marked by 早瀬で and で.