A little-known tone poem from Australian Romantic composer Alfred Hill simply entitled 'The Sea', was written during World War II, and was inspired by thoughts of those who had lost their lives at sea. It has sadly never been issued on CD, but there is a very good LP upload of the work on YouTube:
http://www.youtube.com/watch?v=lgHkv9RmAhE
There are one or two decent Chinese orchestral pieces to do with the sea, and while they aren't the equal of, say, Debussy's La Mer, they are still quite attractive and worth checking out:
Song of the Sea, a tone poem by Wang Zong-jian and Wang Shu-feng, much in the style of Glazunov's The Sea. (HK 8.340069).
Ocean Symphony, by Sheng Li-hong (HK 8.340070) with a gorgeous slow movement called Meditation after the Storm.
Back to the Glazunov Sea for a moment, try listening to the Gennadi Provatorov version with the Moscow Radio Symphony Orchestra, released on Olympia, coupled with the ballet Les Ruses D'amour. It is an absolute knockout, way superior to the Jarvi (Chandos) version or even the recent Serebrier recording on Warner.