展てん望ぼう台だい

noun

observation deck; viewing platform

A raised platform or deck, often in a tower, building, or scenic spot, designed for looking out over a view.

• 東とう京きょうタワーの展てん望ぼう台だいから街まちを見み下おろした。

  I looked down at the city from the observation deck of Tokyo Tower.

• この山やまの頂ちょう上じょうには展てん望ぼう台だいがあります。

  There is a viewing platform at the top of this mountain.