continent river barrow
The River Shannon is the longest river in Ireland at . It drains the Shannon River Basin which has an area of , one fifth of the area of Ireland . ___MASK15___ is a continent that comprises the westernmost part of Eurasia . ___MASK15___ is bordered by the Arctic Ocean to the north , the Atlantic Ocean to the west , and the Mediterranean Sea to the south . To the east and southeast , ___MASK15___ is generally considered as separated from Asia by the watershed divides of the Ural and Caucasus Mountains , the Ural River , the Caspian and Black Seas , and the waterways of the Turkish Straits . Yet the non - oceanic borders of ___MASK15___  a concept dating back to classical antiquity  are arbitrary . The primarily physiographic term " continent " as applied to ___MASK15___ also incorporates cultural and political elements whose discontinuities are not always reflected by the continent ' s current overland boundaries . The Barrow ( Irish : An Bhearú ) is a river in Ireland . It is one of The Three Sisters ; the other two being the River Suir and the River Nore . The Barrow is the longest of the three rivers . At 192 km ( 120 mi ) , it is the second - longest river in Ireland , behind the River Shannon . The catchment area of the River Barrow is 3 , 067 km2 . The river ' s long term average flow rate is 37 . 4 cubic metres per second . The source of the River Barrow is at Glenbarrow in the Slieve Bloom Mountains in County Laois . Among the towns that the River Barrow passes through on its way to the sea in Waterford are Portarlington , Monasterevin , Athy , Carlow / Graiguecullen , Muine Bheag ( i . e . Bagenalstown , ) Graiguenamanagh , and New Ross . The river also forms a natural border between parts of counties Kilkenny and Carlow and Kilkenny and Wexford . The British Isles are a group of islands off the north - western coast of continental ___MASK15___ that consist of the islands of Great Britain , Ireland and over six thousand smaller isles . Situated in the North Atlantic , the islands have a total area of approximately 315 , 159 km , and a combined population of just under 70 million . Two sovereign states are located on the islands : Ireland ( which covers roughly five - sixths of the island with the same name ) and the United Kingdom of Great Britain and Northern Ireland . The British Isles also include three Crown Dependencies : the Isle of Man and , by tradition , the Bailiwick of Jersey and the Bailiwick of Guernsey in the Channel Islands , although the latter are not physically a part of the archipelago . Great Britain , also known as Britain , is a large island in the north Atlantic Ocean off the northwest coast of continental ___MASK15___ . With an area of , Great Britain is the largest European island and the ninth - largest in the world . In 2011 the island had a population of about 61 million people , making it the world ' s third - most populous island after Java in Indonesia and Honshu in Japan . The island of Ireland is situated to the west of it , and together these islands , along with over 1 , 000 smaller surrounding islands , comprise the British Isles archipelago . Ireland ( Ulster - Scots : ) is an island in the North Atlantic . It is separated from Great Britain to its east by the North Channel , the Irish Sea , and St George ' s Channel . Ireland is the second - largest island of the British Isles , the third - largest in ___MASK15___ , and the twentieth - largest on Earth .