You asked:

is saimaa deeper than lake simcoe

Yes. Saimaa is deeper than Lake Simcoe. Saimaa is 269 feet and Lake Simcoe is 135 feet.
Lake Simcoe
Lake Simcoe

Lake Simcoe, the lake in southern Ontario, Canada, the twelfth-largest lake in the province

Saimaa
Saimaa

Saimaa (is pronounced "saima:"), or Saimen in Swedish, the lake in southeastern Finland

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