It is also traditionally divided into the four provinces of Connaught, Leinster, Munster and Ulster. Connaught is the Western province, Munster is the South West province, Leinster is the Eastern province and Ulster is the Northern province which includes 9 countries. Of the 9 countries, 6 are in Northern Ireland and the other 3 are in the Republic of Ireland. Ireland has a few geographic points visible on a map. Ireland's highest mountain is Carrantuohill in the Macgillycuddy Reeks (mountain range) in County Kerry, rising to 3,406 feet. Ireland's longest river is the Shannon, which stretches for 224 miles and separates the west from the east and south. The largest lake in the country is Lough Neagh in Ulster, it measures 151.4 miles in diameter and 18.64 miles in length at its greatest distance..