Cortober (Irish: Corr an Tobair, meaning "round hill of the spring well").
Cortober is a townland in the counties of Roscommon and Leitrim Carrick-on-Shannon and is divided between the River Shannon.
At the north-eastern extremity of the Parish. Bounded on the north by the Parish of Tumna and River Shannon, on the east by the River Shannon, on the south by the townland of Cordrehead and Killukin and on the west by Mullaghmore.