Magnificent caves are found on both slopes of the peninsula, those at Batu in Selangor being the finest on the west coast, while those of Chadu and Koto Glanggi in Pahang are the most extensive yet visited by Europeans on the east coast.
The Federated Malay States under British protection consist of the sultanates of Perak, Selangor and the Negri Sambilan on the west coast, and the sultanate of Pahang on the east coast.
In 1874 the Malay state of Perak was placed under British protection by a treaty entered into with its sultan; and this eventually led to the inclusion in a British protectorate of the neighbouring Malay States of Selangor, Sungei Ujong, the cluster of small states called the Negri Sembilan and Pahang, which now form the Federated Malay States.
This is mainly due to the construction of the railway which runs from a point on the mainland opposite to Penang, through the Federated Malay States of Perak, Selangor and the Negri Sembilan to Malacca, and has diverted to other ports and eventually to Singapore much of the coastal traffic which formerly visited Penang.
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