Borneo
In Borneo mainland, Indonesia has land border with Malaysia, and also shared the same island with Brunei.
Indonesia has 5 provinces in this region, West, Central, East, North and Southeast.
Getting There
Currently I've only visited Pontianak (West) on Indonesia side by sea. It takes 2 days to reach Pontianak from Jakarta. The sea port is located near the city center.
Pontianak
Food is really nice and affordable.
Getting Around
It costs around BND 100 or IDR 1.1 million one way from Pontianak to Brunei using Damri bus. At that time I didn't get a chance to try since the bus is only available every other day.
There's also bus from Kuching to Pontianak.