Japanese · Pronunciation Guide
u-mi, two short beats, opening on an unrounded u — lips flat, not pursed.
umi
Both beats are equally short, with the melody high on the first and dropping onto the second. Neither vowel is lengthened, which makes the word noticeably quicker than an English speaker's first attempt at two syllables.
Listen: 海
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夏は海に行きます。
Natsu wa umi ni ikimasu.
In summer I go to the sea.
Listen: 夏は海に行きます。
Free browser voice. Hear it read by a real native speaker inside the LingoDrop app.
夏は海に行きます opens with 夏 (na-tsu), whose affricate must be a single gesture, and closes with 行きます, where the ki tends to devoice. So the sentence runs from an unrounded u through an affricate to a whispered vowel, all at the same tempo.
"OO-mee" rounds the opening vowel, stretches it, and doubles the length of the final i. The rounding is the loud error — check in a mirror that your lips stay flat as the word begins. Then halve the i and keep both beats matched.