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Islands with Longest Maximum Distances to the Sea

Which islands have interior points farthest from the sea? In other words, a circle with the given radius can fit inside them.
Approximate distance given in kilometers
Quiz by interopia
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Last updated: January 6, 2020
First submittedJanuary 2, 2020
Times taken40
2:30
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Distance
Island
475
Greenland
345
Borneo
310
New Guinea
270
Madagascar
170
Sumatra
130
Victoria Island
125
South Island
120
Iceland
Distance
Island
115
Great Britain
115
Honshu
110
Newfoundland
110
North Island
110
Hokkaido
110
Sri Lanka
105
Tasmania
100
Luzon
100
Baffin Island
+1
level 77
Jan 2, 2020
Don't you mean "Minimum" instead of "Maximum" in the title?
+1
level 78
Jan 2, 2020
For each island I found the point from which the maximum distance to the sea is. These are the islands that have the longest maximum distances. Does that make sense? The minimum distance to the sea would be at the coast for all of these...which would be zero.
+1
level 71
Jan 3, 2020
nice idea! I think UK is 113 km - https://en.m.wikipedia.org/wiki/Coton_in_the_Elms
+1
level 78
Jan 6, 2020
Thank you for that. I estimated the distances myself by drawing circles that could fit inside of the island. However, it was sometimes hard to judge where exactly the coast should begin. For example, if a wide river gradually narrows as it comes inland, at what point does the coast start? However I will change Britain to that measurement.