Astylosternus
It contains 12 species found in an area spanning from Sierra Leone in West Africa to the Democratic Republic of Congo in Central Africa , with a gap in the region of Ghana . 
<triplet> Sierra Leone <subj> West Africa <obj> part of <triplet> West Africa <subj> Sierra Leone <obj> has part <subj> Central Africa <obj> shares border with <subj> Ghana <obj> has part <triplet> Central Africa <subj> West Africa <obj> shares border with <subj> Democratic Republic of Congo <obj> has part <triplet> Ghana <subj> West Africa <obj> located on terrain feature