The system is located almost at the bottom of the Tree region of the Rentocniijik Expanse. Towards the right hand side, if you place the galactic centre in the middle or 'trunk' of the tree region.
When trying to locate Inzo-Mago, look for a Blue star system at the bottom right of the Rentocniijik Expanse tree with two planets. Inzo-Mago is just above that.