Public Transportation in Sri Lanka is based mainly on the road network which is centred on Sri Lanka's capital, Colombo. Good network of metalled roads exists in Sri Lanka linking all major towns and tourist destinations such as Kandy, Anuradhapura, Polonnaruwa, Sigiriya, Galle, kataragama, Puttalama, etc. There is also an extensive railway network but it is largely a legacy of British colonial rule and is less appropriate for the modern transport requirements of Sri Lanka. There are also navigable waterways, harbours and airports, including an international airport, located in Katunayake, 22 miles north of Colombo. The highways and roadways around the capital are in very good condition and being upgraded constanstaly.