Uzushiogakure

was the shinobi village of the Land of Whirlpools. Its ninja were renowned for their fūinjutsu to the point that it led to its destruction in war. Those who survived the village's destruction scattered across the globe to seek refuge.

Background
The people of Uzushiogakure were noted to have notoriously long lives, so it gained the epithet. In terms of appearance, the village seemed to have been composed of several high-rise buildings. A wide river seemingly ran through the village and was gapped by large bridges. The surrounding countryside was dominated by steep hills.

Uzushiogakure had close ties with Konohagakure, due to Uzushio's Uzumaki clan and Konoha's Senju clan being distant blood relatives. Because of this, all flak jackets worn by the chūnin and jōnin-level shinobi of Konohagakure bear the crest of Uzushiogakure, symbolising the strong friendship between both villages. This symbol is also emblazoned on some of the shoulders of the outfits that the Konoha shinobi wear underneath the flak jackets.

Trivia

 * According to Kushina Uzumaki, the Four Symbols Seal was based on the fūinjutsu of this village.
 * The destruction of the village occurred during Kushina's lifetime, either shortly before or just after her family moved to the Leaf.