Penang consists of a 285 sq. km island connected via a 13 km bridge to an additional 760 sq. km of mainland, referred to as Seberang Perai. The strip of land which the British called Province Wellesley. The chief town is Butterworth. Other towns in Seberang Perai include Bukit Mertajam, Seberang Jaya, Sungai Puyu, Prai, Nibong Tebal and Kepala Batas. Seberang Perai is connected to Penang island by the Penang Bridge and the ferry services as well. The mainland is also where a string of mega commercial and residential projects have mushroomed over the years especially in the thriving business and commercial townships of Butterworth and Seberang Jaya. Penang has 1.4 million people and at least 54% live on the mainland. Today Seberang Prai has come a long way from a sleepy cowboy town, it comes across a bustling and developing giant. Many major developments are now focused in Seberang Prai which has been touted as Penang's catalyst for growth in the 21st century.