La mer, trois esquisses symphoniques pour orchestre (French for The sea, three symphonic sketches for orchestra), or simply La mer (i.e. The Sea), is an orchestral composition by Claude Debussy. Composed between 1903-5, it piece was initially not well received, but soon became one of Debussy's most admired orchestral works. La mer is scored for 2 flutes, piccolo, 2 oboes, cor anglais, 2 clarinets, 3 bassoons, contrabassoon, 4 horns, 3 trumpets, 2 cornets, 3 trombones, tuba, timpani, bass drum, cymbals, triangle, tamtam, glockenspiel, 2 harps and strings. The work has proven very influential, and its use of sensuous tonal colours and its orchestration methods have influenced many later film scores. While the structure of the work places it outside of both absolute music and programme music as those terms were understood in the early 20th century, it obviously uses descriptive devices to suggest wind, waves and the ambience of the sea. But structuring a piece around a nature subject without any literary or human element to it - neither people, nor mythology, nor ships are suggested in the piece - also was highly unusual at the time.

La Mer - 1 - De laube a midi sur la mer

La Mer - 2 - Jeux de vagues

La Mer - 3 - Dialogue du vent et de la mer

Reference : https://musopen.org/music/451/claude-debussy/la-mer/