Transport is one of the biggest challenges in the Maldives. Islands are remotely located and moving between islands means travelling across water. There are a few islands that are big enough to be linked via bridges and causeways. On these islands a land transport service may be viable. By and large, the Transport Sector is dominated by maritime and air transportation. Male, the country's commercial and financial center, has a well developed sea port and the country's only international airport for passenger traffic.