The eastern portion of the district is the ordinary alluvial plain of the Gangetic delta; the western part consists of undulating beds of laterite resting on a rock basis, and covered with small scrub jungle.
It occupies, in great part, the low alluvial plain that skirts the shores of the bay and fills the valleys between numerous low wooded hills.
In contrast with the arid plateau of Mesopotamia, stretched the rich alluvial plain of Chaldaea, formed by the deposits of the two great rivers by which it was enclosed.
Derwentwater and Bassenthwaite occupy a single depression, a flat alluvial plain separating them.
The uplands of this district are bounded by the low alluvial plain of Sedgemoor on the east, by the lower basin of the Exe on the south, by the basin of the Taw (in part) on the west, and by the Bristol Channel on the north.
The stretch from Samsat and Jeziret-ibn- 'Omar to the alluvial plain seems to divide itself naturally into three parallel belts, highland watershed district, un- Geography.
A little below the town of Glarus the river, keeping its northerly direction, runs through the alluvial plain which it has formed, towards the Walensee and the Lake of Zurich.
From its source, falls into the Gulf of Cambay, forming near its mouth the alluvial plain of Broach, one of the richest districts of Bombay.
A little south of Samarra the stony plateau of Mesopotamia ends, and the alluvial plain of Irak, ancient Babylonia, begins.
At the point of entering the alluvial plain the bed of the Tigris seems to be lower than that of the Euphrates, so that the canals run from the latter to the former stream.