Some interesting Islands and Lakes

Largest Island
Greenland (DEN)
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Largest lake
Caspian Sea (RUS/KAZ/AZE/TKM/IRN)
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Largest lake on an island
Nettilling Lake on Baffin Island (CAN)
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Largest island in a lake
Manitoulin Island in Lake Huron (CAN)
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Largest island in a lake on an island
Pulau Samosir in Danau Toba on Sumatera (INA)
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Largest lake on an island in a lake
Lake Manitou on Manitoulin Island in Lake Huron (CAN)

and

Largest island in a lake on an island in a lake
Island in Mindemoya Lake on Manitoulin Island in Lake Huron (CAN)
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Largest lake on an island in a lake on an island
Crater Lake on Vulcano Island in Lake Taal on Luzon (PHI)
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Largest island in a lake on an island in a lake on an island
Vulcan point in Crater Lake on Vulcano Island in Lake Taal on Luzon (PHI)