crown of the causeway

Translations
верхушка дамбы
The crown of the causeway was covered in flowers during the spring festival.
Верхушка дамбы была покрыта цветами во время весеннего фестиваля.
Definitions
The 'crown of the causeway' refers to the highest point or central ridge along the surface of a causeway (a raised road or path across low or wet ground). This crown is designed to allow water to drain off to either side, preventing water accumulation and damage to the roadway.