Maringa River
The Maringa , and the Lopori River to the north , join near Basankusu to form the Lulonga River , a tributary of the Congo River . 
<triplet> Lopori River <subj> Lulonga River <obj> mouth of the watercourse <triplet> Lulonga River <subj> Lopori River <obj> tributary <subj> Congo River <obj> mouth of the watercourse <triplet> Congo River <subj> Lulonga River <obj> tributary