Tafuna-Leone Plain

The Tafuna-Leone Plain forms the largest contiguous expanse of level, developable land in American Sāmoa.

[2] Much of Tutuila Island, especially its mountainous northern region, consists of older volcanic formations characterized by low permeability.

[4] Adjacent to the Fatuoaiga Catholic Church Center and the Tia Seu Lupe Historic Monument at Ottoville, a 20-acre reserve protects the island's last remaining lowland rainforest on Tutuila.

[5][6][7] It is the largest expanse of level terrain on Tutuila Island, covering approximately 35 square kilometers (13.5 sq.

[8] Its terrain includes numerous hills rising more than 183 meters (600 ft.), formed by Holocene volcanic eruptions overlying a preexisting barrier reef.