 Their "brother" supporter is Barito Mania, the supporter of PS Barito Putera.Derby Kaltim (East Borneo derby)The match of Borneo F.C.against Persiba Balikpapan is called ""Derby Kaltim"", because Samarinda (city home of Borneo FC) and Balikpapan (city home of Persiba Balikpapan) are the same as cities in East Kalimantan Province.