Miri River is the body of water that splits Miri Peninsula and the mainland Miri, flowing out to sea from inland, curving at Lutong Town. In one particularly popular but inaccurate online map service, the river is incorrectly marked as Sungai Baong. Others references online have confused it with Baram River.
The old Piasau bridge was a Bailey bridge at Piasau linking from the peninsular to Piasau at the point closest to the sea. The bridge, originally made of steel and wood with a single lane to handle the occasional vehicle traffic crossing, has seen several upgrades over the years.
In the 1920s, these were the years when the Miri field began to decline. Exploration was carried out further and further afield. In 1926 an exploratory team had gone as far as Padang Barawa between the Sungai Seria and Sungai Barawa. Not much attention was paid to their findings then, but now with the Miri field declining the old maps and charts were taken out and studied again.