90秒で分かる「たくさん」はなぜ「沢」と「山」?

沢山(たくさん)って「いっぱいある」という意味ですが、なぜこんな漢字なんでしょう?沢山の語源を90秒でサクッと理解しちゃいましょう!
Learn common Kansai-ben words in 90 seconds! Learn common Kansai-ben words in 90 seconds!
Learn Japanese vocabulary in 90 seconds - Theme: Animals! Learn Japanese vocabulary in 90 seconds - Theme: Animals!
Learn Japanese vocabulary in 90 seconds - Theme: Trains! Learn Japanese vocabulary in 90 seconds - Theme: Trains!
Learn Japanese vocabulary in 90 seconds - Theme: Appearance! Learn Japanese vocabulary in 90 seconds - Theme: Appearance!