was a district located in Shiga Prefecture, Japan.
As of 2003, the district had an estimated population of 147,928 and a density of 267.90 persons per km<sup>2</sup>. The total area was 552.18 km<sup>2</sup>.
From circa 1460 until 1574, during the Sengoku period, the district was effectively independent of centralized state control and operated as the Kà Âka-gun Chà «sà Â, a military confederacy of jizamurai and other warrior families that became known as ninja. During this period it formed an alliance with its southern neighbor, the Iga Sokoku Ikki, a similar independent confederacy of ninja families. Both alliance and the ikki ended when Oda Nobunaga defeated Kà Âka and compelled it to be a vassal.
Before the dissolution in 2004, the district had seven towns as listed below. Each municipality is now a part of the city noted in the parentheses.