The LAC is 4,057-km long and traverses three areas of northern Indian states : western ( Ladakh , Kashmir ) , middle ( Uttarakhand , Himachal Pradesh ) and eastern ( Sikkim , Arunachal Pradesh ) . The LAC is 4,057-km long and traverses three areas of northern Indian states : western ( Ladakh , Kashmir ) , middle ( Uttarakhand , Himachal ) and eastern ( Sikkim , Arunachal ) .