The western part of the region around Western Port Bay and the Bunyip River is mostly flat (much of it having been reclaimed from the drained Koo Wee Rup Swamp), while the eastern part consists of low rolling hills.
To the north these hills become steeper as they merge into the Great Dividing Range. Relatively fertile, the lowland areas are mainly given over to dairy farming, but are also noted for their niche agricultural produce, giving rise to the term "Gippsland Gourmet Country". In the mountainous north around Noojee logging remains an important industry, while a small winter resort is located to the northeast at Mount Baw Baw. Further to the east are the small township of Erica and the historic gold mining town of Walhalla.
Nature reserves in the region include Bunyip State Park, Mount Worth State Park and Baw Baw National Park. Principal towns of West Gippsland include (from west to east along the Princes Highway) Pakenham, Drouin, Warragul and Trafalgar.
Due to its proximity to the Melbourne metropolitan area, the westernmost region around Pakenham has experienced significant residential growth in recent years.