Japanese · Pronunciation Guide
ya-ma, two short beats with two identical a's — "ya" is one mora, not "ee-ya."
yama
Two matched beats built on the same vowel twice. In standard Tokyo speech the pitch rises from ya to ma and then drops on whatever particle follows — a pattern known as 尾高, where the fall lands outside the word itself.
Listen: 山
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山に登るのが好きです。
Yama ni noboru no ga suki desu.
I love climbing mountains.
Listen: 山に登るのが好きです。
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山に登るのが好きです ends with 好き, whose two vowels both devoice into something close to "ski," and 登る (no-bo-ru) has a tap at the end. So the sentence pairs two clearly-voiced beats at the start with a nearly voiceless pair at the finish.
"YAH-ma" stretches and stresses the first beat while weakening the second toward a schwa. Both a's should be short, bright and identical. Learners also sometimes split ya into "ee-ya," which turns a two-beat word into a three-beat one and makes it unrecognisable.