Geology and Geography
Most of the headwaters flow over carboniferous coal measures overlain by glacial drift and fluvial gravels. The valleys are reasonably broad for a small river and many of the tributaries meandered through their valleys in the past. The considerable urbanisation, especially in the 19th century confined most rivers to rather narrow artificial channels bordered in places such as Bridgend with concrete flood protection walls.
Read more about this topic: River Ogmore
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“Ktaadn, near which we were to pass the next day, is said to mean “Highest Land.” So much geography is there in their names.”
—Henry David Thoreau (1817–1862)