

明日、山に登ります。
私の町は山が多いです。
週末、山に行きませんか。
"やま(山)" is in the lesson "Countryside" (Level 16), along with 10 other useful words. LinDuo has 180 topic lessons like this one, 2,379 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.