Mukim Serasa is a mukim in Brunei-Muara District, Brunei. The population was 16,173 in 2016. The mukim encompasses Muara Town, home t…Mukim Serasa is a mukim in Brunei-Muara District, Brunei. The population was 16,173 in 2016. The mukim encompasses Muara Town, home to Muara Port, the country's only deepwater port.