湖面

1. Origins, structure, and basic meaning

• Structure: 湖面 (こめん) is a geographical compound noun for the upper surface of a lake.
• Basic usage: 朝日が湖面に映る marks the surface receiving the sun’s reflection, while 湖面に波が立つ marks where ripples arise in the wind.

2. Common pitfalls and similar expressions

• Lake as a whole and its surface
  • 湖面に points to the water’s surface in both examples. It should not be broadened to place the sunlight or ripples on the lakebed or all surrounding land.