Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: A karni na 15, daular ta zama jihar musulmi, lokacin da Sarkin Brunei ya koma addinin Islama, wanda 'yan Indiyawan Musulmi da' yan kasuwa Larabawa suka kawo daga wasu sassan kudu maso gabashin Asiya, wadanda suka zo kasuwanci da yada Islama. Ya mallaki yawancin arewacin Borneo, kuma ya zama muhimmiyar cibiya ga tsarin kasuwanci na Gabas da Yammacin duniya. Masana tarihi na gida sun ɗauka cewa daular Brunei wata daular talassocratic ce wacce ta dogara da ikon teku, wanda ke nufin tasirinsa ya takaita ne ga garuruwan bakin teku, tashar jiragen ruwa da kogin kogin, kuma da wuya ya shiga cikin tsibirin. Sarakunan Brunei kamar sun kulla kawance da mutanen yankin na Orang Laut da Bajau wadanda suka kafa rundunar sojan ruwa. Duk da haka, Dayaks, kabilun 'yan asalin Borneo na ciki, ba sa ƙarƙashin ikonsu, saboda tasirin mulkin mallaka ba sa saurin shiga cikin dazuzzuka.Bayan kasancewar Fotigal bayan faduwar Malacca, 'yan kasuwar Fotigal sun yi kasuwanci a kai a kai tare da Brunei daga 1530 kuma sun bayyana babban birnin Brunei kamar yadda bangon dutse ya kewaye shi.A lokacin mulkin Bolkiah, Sultan na biyar, daular ta mallaki yankunan bakin teku na arewa maso yammacin Borneo (yanzu Brunei, Sarawak da Sabah) kuma sun isa Seludong (Manila na yanzu), Sulu Archipelago gami da sassan tsibirin Mindanao. A cikin karni na 16, tasirin masarautar Brunei ya kai har zuwa Kogin Kapuas a Yammacin Kalimantan. Sultanate na Malay na Sambas a Yammacin Kalimantan da Sultanate na Sulu a Kudancin Philippines musamman sun haɓaka alaƙar sarauta tare da gidan sarauta na Brunei. Sauran sarakunan Malay na Pontianak, Samarinda har zuwa Banjarmasin, sun ɗauki Sultan na Brunei a matsayin shugabansu. Hakikanin yanayin dangantakar Brunei da sauran masarautun Malay na bakin tekun Borneo da tsibirin Sulu har yanzu batun bincike ne, game da ko jihar ce, ko kawance, ko kuma dangantakar al'ada. Sauran yankuna na yanki kuma sun yi amfani da tasirin su akan waɗannan sultanates. Masarautar Banjar...  Tambaya: Daular Brunei tana cikin wane yanki na Kamimantan ta Yamma?
Kogin Kapuas Delta