Rumbai at present is a district of Pekanbaru, Riau Province, Sumatra, Indonesia.
In the early 1950s, Rumbai could only be reached from the outside world by river boat, from Pekanbaru or from Bengkalis.
A road was built by Caltex to the Minas and Duri oilfields and camps.
The oil camp of Rumbai was a completely self-contained mostly expatriate community with offices, homes, school, hospital, water treatment, diesel generators, commissary, country club, swimming pool, and golf course.
In 1958 a floating bridge was built by Caltex over the Siak River.