The Toi gold mine was an important gold mine during the Edo period in Japan, located within what is now part of the city of Izu, Shizuoka Prefecture in the middle of the Izu Peninsula. It remained in operation to the mid-twentieth century.

Izu is a city located in central Izu Peninsula in Shizuoka Prefecture, Japan. As of 1 April 2019, the city had an estimated population of 30,678 in 13,390 households, and a population density of 84 persons per km2. The total area of the city was 363.97 square kilometres (140.53 sq mi).