rotenburo wa soto ni aru.

The open-air bath is outside.

Breakdown of rotenburo wa soto ni aru.

• は: topic particle
• 外そと に: outside
• ある: to exist/have
• 露天風呂ろてんぶろ: an open-air hot-spring bath

Questions & Answers about rotenburo wa soto ni aru.

How do you read 露天風呂 は 外 に ある?

It is read:

ろてんぶろ は そと に ある。

• 露天風呂（ろてんぶろ） = open-air bath
• 外（そと） = outside
• ある = to exist, to be located

So the pronunciation is:

Rotenburo wa soto ni aru.

What exactly is 露天風呂? Why isn’t it split up?

露天風呂 is a single compound noun.

• 露天（ろてん） = open air
• 風呂（ふろ / ぶろ） = bath

When combined, 風呂 becomes ぶろ because of a common sound change in compounds. So:

• 風呂 by itself: ふろ
• in 露天風呂: ぶろ

Together, 露天風呂 means open-air bath. Japanese often combines nouns like this into one word.

Why is は used after 露天風呂?