East Malaysia is 50% bigger than Peninsular Malaysia at , comparable with South Dakota or Great Britain. East Malaysia contains the five highest mountains in Malaysia, the highest being Mount Kinabalu at 4095 m, which is also the highest mountain in Borneo and the 10th highest mountain peak in Southeast Asia. It also contains the two longest rivers in Malaysia – Rajang River and Kinabatangan River. Banggi Island in Sabah and Bruit Island in Sarawak are the two largest islands that are located entirely within Malaysia. The largest island is Borneo, which is shared with Indonesia and Brunei. The second largest island
Brunei–Malaysia border sections which were not covered by these agreements, the two countries agreed that their common border will be delimited based on the watershed principle. In addition, the two countries agreed to push for the joint demarcation and survey of their common border, through the establishment the necessary structures and processes to carry this out. The Memorandum of Understanding on the Process for the Joint Demarcation and Survey of the Land Boundary was signed on 19 March 2012 in Johor Bahru, Malaysia. The MOU, which was signed during the 8th Malaysia–Brunei Darussalam Meeting on the Implementation of the 2009 Exchange of