In a narrow sense, it can be said that the couplet includes mountains, peaks, mountains, rivers, lakes, rivers, streams, streams, waters, rivers, seas, etc.
In a broad sense, it can be said that as long as it is a noun word, it can.
For example, spring is everywhere; Thousands of rivers and mountains shine.
Another example: the sea is wide, the lake is clear, and the rain and lotus ripples in all directions are green; Bamboo breeze, chrysanthemum indifferent, live alone leisurely Nanshan.