County Limerick (Contae Luimnigh in Irish) is a county in the province of Munster, located in the mid-west of Ireland with County Clare to the north, County Cork to the south, County Kerry to the west and County Tipperary to the east. The River Shannon flows through the city of Limerick and into the Atlantic Ocean at the north of the county. Below the city, the waterway is known as the Shannon Estuary. Because the estuary is shallow, the county's most important port is several kilometres west of Limerick city, at Foynes.