un·chart·ed 
/ˌʌnˈtʃɑɚtəd/ adjective
/ˌʌnˈtʃɑɚtəd/ adjective : not recorded or located on a map, chart, or plan
▪ an uncharted island — often used figuratively ▪ The discussion moved into uncharted territory/waters. [=moved into a new and unknown area]
▪ an uncharted island — often used figuratively ▪ The discussion moved into uncharted territory/waters. [=moved into a new and unknown area]
