Noida extension is Sector 1 and Sector 4 of Greater Noida.
These area are around 4-5 kms from Sector 121, Noida, i.e. the road from Sector 121 would pass over Hindon river and reach Sector 1/4 in Greater Noida.
The bridge over Hindon is ready.
These sectors in Greater Noida are around 7-8 kms from Noida city center.