The village and parish lies on a bedrock of Oxford clay from the Jurassic period.
The land in the north of the parish is characterised as Oadby Member Diamicton, from the Quaternary period, with rocks formed during Ice Age conditions by glaciers scouring the land.
The village lies between 55 feet (17 m)  and 172 feet (52 m) above sea level.

The A14 road that runs from the Port of Felixstowe to the Catthorpe Interchange, Leicestershire passes through the north of the parish.
 Ellington village itself lies immediately to the south of Junction 20 of the A14 road.
   About 2 miles (3.2 km) south of the village is Grafham Water, which is a large reservoir with a circumference of approximately 10 miles (16 km).
It is the eighth largest reservoir in England by volume and the third largest by area.
Today the reservoir is mainly used by Grafham Water Sailing club and Grafham Water Activities Centre.

In 1932, Ellington was described as being a "curiously shaped parish" from information in the Victoria County History series.
The article talks about the general shape of the village and how the shape of Ellington consists of the main village as well as a stretch of land to both the west and the south.
It also describes a stream, The Ellington Brook, "That flows from east to west" defining Ellington's boundary on the west stretch of land.
The stream also joins up to the Alconbury Brook East of the village which flows from the village of Spaldwick.
The village and parish lies on a bedrock of Oxford clay from the Jurassic period. The land in the north of the parish is characterised as Oadby Member Diamicton, from the Quaternary period, with rocks formed during Ice Age conditions by glaciers scouring the land. The village lies between 55 feet (17 m)  and 172 feet (52 m) above sea level.
The A14 road that runs from the Port of Felixstowe to the Catthorpe Interchange, Leicestershire passes through the north of the parish.  Ellington village itself lies immediately to the south of Junction 20 of the A14 road.    About 2 miles (3.2 km) south of the village is Grafham Water, which is a large reservoir with a circumference of approximately 10 miles (16 km). It is the eighth largest reservoir in England by volume and the third largest by area. Today the reservoir is mainly used by Grafham Water Sailing club and Grafham Water Activities Centre.
In 1932, Ellington was described as being a "curiously shaped parish" from information in the Victoria County History series. The article talks about the general shape of the village and how the shape of Ellington consists of the main village as well as a stretch of land to both the west and the south. It also describes a stream, The Ellington Brook, "That flows from east to west" defining Ellington's boundary on the west stretch of land. The stream also joins up to the Alconbury Brook East of the village which flows from the village of Spaldwick.
Ellington, Cambridgeshire