How Big Lake Superior Is Compared To Ireland
Lake Superior covers 82,100 square kilometers. The island of Ireland covers 84,421. Ireland wins by 2,321 square kilometers, which is 2.8 percent, or roughly six Lough Neaghs. That is the closest a lake has any business getting to a country, and if you take the Republic on its own at 70,273 square kilometers, the lake beats it outright. North America has a body of fresh water that outranks a sovereign European state and is only prevented from outranking the whole island by an area the size of County Mayo.
The Island Wins By Three Percent
Comparisons this close are rare enough to be worth stating precisely.
Superior is 97.3 percent the size of the island of Ireland. The gap is 2,321 square kilometers, which is about 16 percent of Northern Ireland or six times Lough Neagh, the largest lake in the British Isles at 390 square kilometers.
Put the other way round, Lake Superior is 211 times the size of the biggest lake in Britain or Ireland. The comparison that works is with the island, not with anything in it.
The Republic Loses
Split the island politically and the result flips, which is the detail worth leading a pub argument with.
The Republic of Ireland covers 70,273 square kilometers, a sovereign state with five million people, 26 counties and a seat at the United Nations. Lake Superior is 1.17 times larger, beating it by 11,827 square kilometers.
Northern Ireland at 14,130 square kilometers does not come close. Superior is 5.8 times its size.
Pour It Over And Ireland Goes Under
Area is the close contest. Volume is not a contest at all.
Lake Superior holds 12,100 cubic kilometers of water. Spread that evenly across the 84,421 square kilometers of Ireland and it stands 143 meters deep.
Carrauntoohil, the highest peak in Ireland at 1,038 meters, would still clear the surface by 895 meters. Nothing else would. Dublin sits at sea level, the midlands are famously flat, and the entire country below 143 meters is a lake.
It Has More Islands Than Ireland Has Counties
The internal geography of the lake holds up surprisingly well against the internal geography of the country.
Lake Superior contains over 400 islands. Ireland has 32 counties. The largest island in the lake, Isle Royale, covers 207 square miles, which makes it bigger than several Irish counties outright.
Isle Royale is also a US national park with its own lakes, and those lakes have their own islands, which is the sort of thing a body of water this size can afford.
The Shoreline Reaches The Bahamas
One statistic from the lake's own promotional material deserves checking and then quoting, because it survives the check.
The Lake Superior shoreline, straightened out, would reach from Duluth to the Bahamas. Ireland's coastline is famously convoluted and considerably shorter.
Both figures suffer from the coastline paradox, where the measured length depends on the length of your ruler, so neither should be treated as precise. The relationship between them survives anyway.
It Holds More Water Than All The Others Combined
Superior's volume needs context beyond Ireland, because the Ireland comparison undersells it.
The lake contains as much water as all the other Great Lakes combined, plus two extra Lake Eries. Its volume is second worldwide only to Lake Baikal.
Surface area is where Superior leads the world outright. It is the largest freshwater lake on Earth by that measure, which is the reason it can be set against a country at all.
Ireland Is Greener For A Reason Superior Shares
There is one genuine physical similarity underneath the size coincidence.
Both are shaped by water in quantity and by the last ice age. Ireland is flat and low in the midlands and ringed by mountains, a pattern glaciers produced. The Superior basin was gouged by the same process at roughly the same time.
Ireland is also among the least forested areas in Europe, while the Superior shore is among the more heavily forested parts of North America. Same geological history, opposite vegetation.
Superior Is Deeper Than Ireland Is High
The vertical comparison is less close than the horizontal one, and it runs the way you would expect.
Superior's maximum depth is 406 meters and its average is 147. Carrauntoohil tops out at 1,038 meters, so the mountain wins comfortably.
But the average depth of the lake, 147 meters, exceeds the height of almost everything built in Ireland. The tallest structure in the country is under 200 meters.
Why This One Is Worth Running
Most scale comparisons need rounding, hedging or a generous reading. This one lands on the nose and then produces a twist.
Superior loses to the island by under three percent, which is close enough that different sources occasionally reverse the result. It beats the Republic by 17 percent, which is not close at all. Both facts are true simultaneously and they sound contradictory until you remember Ireland is two jurisdictions.
That is a rare thing in geography: a comparison where the answer genuinely depends on a political boundary drawn in 1921.
The Scoreboard
Lake Superior is 97.3 percent the size of the island of Ireland and 117 percent the size of the Republic. It holds 12,100 cubic kilometers, enough to drown the country to 143 meters and leave Carrauntoohil as an island.
It has 400 islands to Ireland's 32 counties, a shoreline that would reach the Bahamas, and more water in it than every other Great Lake combined. The only thing Ireland definitively wins is the final 2.8 percent of surface area, and seven million people live on it.
