The main terminal of the Philippine National Railways lies within the city. One commuter railway within Metro Manila is in operation. The line runs in a general north–south direction from Tutuban (Tondo) toward the province of Laguna. The Port of Manila, located at the western section of the city at the vicinity of Manila Bay, is the chief seaport of the Philippines. The Pasig River Ferry Service which runs on the Pasig River is another form of transportation. The city is also served by the Ninoy Aquino International Airport and Clark International Airport.