Each tetrarchy was divided into five provinces, ruled by five chiefs called apo-ulmen; and each province into nine districts, governed by as many ulmen, who were subject to the apo-ulmen, as the latter were to the toquis.
On the east border of the south portion of the basin of the Rio Grande Mindanao is Mt Apo (10,312 ft.), an extinct volcano and the highest elevation in the archipelago.
The Islands Calamignes, manga, Ousl2vda uin/ 'lb ' Vig an ant* .0 S p 14;,f,13‘1 Apo d Pand r,, Tsa.
Rain Hol a,p, /?oa Mill Krc apo P1FaCt¢ rtonvi le; O?Ity a.?'rI a, sto i n p .rian ° earem BrNlmelMihsor5 rys?