Is 'These latter vast regions of forests, rivers, and mountains border the Indonesian state of Kalimantan and the oil-rich sultanate of Brunei.' a fitting logical lead-up to 'There are mountains near to the border with Brunei.'
These latter vast regions of forests, rivers, and mountains border the Indonesian state of Kalimantan and the oil-rich sultanate of Brunei.###There are mountains near to the border with Brunei.