Idjwi is an island located in the middle of Lake Kivu, between Democratic Republic of Congo and Rwanda, belonging to DRC.
The Idjwi Island official guide mentions
Recommended Ferrys run from either Goma / Bukavu.
Both of those cities are located in DRC.
Is there any way to visit it directly from the Rwandan side? Or do I have to pass the border in Goma / Bukavu and catch a ferry there?