Owaissa Lake is a lake in the municipality of Temagami, Nipissing District in Northeastern Ontario, Canada.

It is in geographic Best Township[2][3] and is part of the Saint Lawrence River drainage basin.

It has one unnamed inflow, at the northwest, and one unnamed outflow, at the northeast, which leads to Ferguson Lake on Net Creek.

Net Creek flows via Cassels Lake, Rabbit Lake, the Matabitchuan River, Lake Timiskaming and the Ottawa River to the Saint Lawrence River.

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