Sōtenkakōsekai

Sōtenkakōsekai (蒼天囲世界,World Enclosed by the Azure Sky) is a barrier created by the Soga Clan using their mastery in and is used to protect their home. The Sōtenkakōsekai is Self-Repairing Barrier that extends over the entire village and prevents any water from entering and crushing the village. Along with stopping water from entering, it is able to stop others from entering as well as sensing the village. While the barrier can be powered by chakra if needed, it is often powered by the dragon veins that the village sit atop of.

Trivia

 * While used to protect Shiogakure, a variant of the barrier is used to protect Hanamura.