Chania is the second largest city of Crete and the capital of the Chania regional unit. It lies along the north coast of the island, about 70 km (43 mi) west of Rethymno and 145 km (90 mi) west of Heraklion. Chania Prefecture covers the westernmost end of Crete and features a combination of many beautiful beaches, small fertile plains, high mountains and deep gorges, such as the Samaria Gorge. Chania Prefecture is the greenest part of the island, as the range of the White Mountains ensures the highest rainfall in Crete. Chania is one of the oldest cities in Crete, with a rich and tumultuous history. A city which has preserved its traditional architecture and most of its monuments from Venetian and Turkish times. The Venetian harbour with its lighthouse and the old town in the centre have bestowed on Chania the reputation of the most picturesque city in Crete, welcoming thousands of visitors each year.