Here the ocean becomes a place of belonging. The speaker starts almost like a science lesson, with short, flat lines: "H2O and NaCl," "Water and salt," "Wet." It feels as if they are trying to describe the sea in the simplest way possible. Then the tone softens. The sea is calm at times, stormy at others, but above all peaceful, and the repeated "The sound" shows the speaker slowing down to listen.
The sound of water over pebbles and the waves pulling back is "comforting," and the speaker says it feels "like we belong here." The ending turns the foam on the waves into white horses sprinting toward shore, and the speaker joins them: "We are like the horses." Like the waves, we are heading home. The mood is quiet, warm, and settled. By the last line, the ocean is no longer something to describe from a distance. It is home.