Aoshima, also known as Cat Island, is an island in Ehime Prefecture, Japan, known for its large number of feline residents. Depending on which news article you stumble upon, estimates of feline to human ratio vary from 6:1 to 36:1.

According to Wikipedia, felines were introduced to combat rodents on fishing boats, but remained on the island and reproduced in large numbers. The island is roughly 1 mile (1.6 km) long and was formerly part of Nagahama in Kita District, but as of 2005, is part of Ōzu.