The Eastern Mountains are separated from the Northern Mountains by the Green River, and from the Scarpland Hills in the west by the Meranian River. Their highest ridge, the Lorraine Mountains, reaches almost 2,750 metres (9,320 feet). These mountains form a U, which opens towards the eastern seaboard, its centre occupied by the drainage system of the Molokhondma River. South of the Eastern Mountains lies the deep Lorraine Channel.