It's here somewhere
But take
a plane
or a train.
There's no highway to drive there.

This and the map below are from National Geographic's Atlas of the World.

Do you see it at the bottom of James Bay?

Below, you can see more clearly the location of the town of Moosonee relative to the bay and Ship Sands Island.

The brackish river is full of sandy islands which are formed and constantly shifted by tidal currents from the bay.