Mombasa Island (a 15 square kilomtere coral outcrop) has two ports. The modern Port Reitz in Kilindini is located on the southern side of the island and services the majority of modern ocean going vessels. By far the older and more historic port is that of the 'old harbour', more recently named Port Tudor after the British Royal Navy captain who surveyed the area. Tudior Creek is the name of the channel seperating the northern side of Mombasa from the northern mainland.