Tamoi is a mukim in the Brunei-Muara district of Brunei. It is one of the six water village mukims. All the water village mukims are quite small in size and area and are water-bound. It is located in the heart of Brunei's capital, Bandar Seri Begawan on the waters of the Brunei river. Tamoi is a part of the water village collective though it is actually considered as a mukim itself. It is adjacent to the other six water village mukims. It borders Mukim Kianggeh to the north, west and south, Mukim Sungai Kedayan to the east and Mukim Burong Pingai Ayer to the south.