For 10 points, name this region along the India-Pakistan border, the birthplace of Sikhism.
The ruler Menander I Soter established his capital at Taxila in this region, and it had earlier been the site of the Battle of the Hydaspes in which its King Porus was defeated by Alexander the Great. A state of this name shares with Haryana its capital, Chandigarh, which was planned by Le Corbusier, and Ludhiana is the largest city of one state by this name. The Beas, Chenab, Jhelum, Ravi and Sutlej are the five rivers which give this region its name, and it is home to Faisalabad, Rawalpindi and Lahore, three of the four largest cities of one country which shares it. This region was the site of Operation Blue Star in 1984, in which Indira Gandhi ordered a strike on the militants in the Golden Temple of its city of Amritsar. For 10 points, name this region along the India-Pakistan border, the birthplace of Sikhism.
The ruler Menander I Soter established his capital at Taxila in this region, and it had earlier been the site of the Battle of the Hydaspes in which its King Porus was defeated by Alexander the Great.
{Punjab}