The Jungle Railway is one of the great train journeys of Southeast Asia, spanning the length of Peninsula Malaysia through its rugged interior. Officially known as the East Coast Railway Line (ECRL), the Jungle Railway travels from Johor Bharu near the Singapore-Malaysia border in the south, to Tumpat near the Thailand border on the east coast. For much of the 526 km, the railway follows the rivers through the mountains. Like the water of the rivers, the builders of the railways followed the path of least resistance rather than making straight lines with viaducts and tunnels.