Kasumigaura (かすみがうら市, Kasumigaura-shi?) is a city located in Ibaraki, Japan. Kasumigaura was formerly a town in Niihari District and became a city on March 28, 2005 after merging with the neighboring town of Chiyoda, also from Niihari District. The city takes its name from the nearby lake, Lake Kasumigaura (霞ヶ浦). The city has the distinction of having the longest name in Japan (in terms of the number of characters used), together with Ichikikushikino and Tsukubamirai.