Explanation:

Ludhiana is the largest district of Punjab both by area and population. The area of Ludhiana district is 3767 sq. km. and its total population according to census 2011 is almost 35 lakh.

It is bounded on the north by the Satluj River, which separates it from Jalandhar district. The river forms its northern boundary with Hoshiarpur district. On other sides it shares common boundaries with Rupnagar district in the east, Moga district in the west, and Barnala, Sangrur and Patiala districts in the south and southeast, respectively.