Rondonia rhymes with:
adonia, caledonia, cydonia, donia, idonia, macedonia, madonia, new-caledonia, sidonia, vidonia
Rondonia sounds like:
ramadan, ramtane, ramthun, random, remediation, rendina, rendition, rendon, renomination, renton, rondon, rumination, run-down, rundown, rwandan, ryanodine