The first option includes whole of the Chennai district, Madhavaram, Ambattur, Poonamallee, Ponneri, Gummidipoondi, Uthukottai, and Thiruvallur taluks of the Tiruvallur district, and Alandur, Pallavaram, Tambaram, Sholinganallur, Chengalpattu, Thiruporur, and Sriperumbudur taluks of the Kancheepuram district extending up to 4459 sqkm .