Lampi Island is about 48 km long and has a maximum width of 6 km. The northern part of the island curves sharply to the west, forming a large bay in which Kubo Island is situated. The topography of Lampi is generally hilly and rises steeply from sea level to l50-270m, exceeding 350m in places. Much of the coast is rocky, although there are a number of sandy beaches, bays and inlets. The sea between Lampi and the mainland is nowhere deeper than 24m and is generally about half that depth.
Lampi Island is densely covered by mostly undisturbed climax low tropical evergreen forest, dominated by dipterocarps, especially Dipterocarpus alatus. Among the many species, Epiphytic are abundant and include lianas Calamus spp. Sandy beaches are known to support beach forest and some have pure stands of Casuarina equisetifolia, as well as species of Dillenia and Calophyllum. Estuaries on the west coast of the island support apparently untouched mangrove formations.
Populated area here is limited to a small fishing village on Pulau Nala Island, which is about 1.6 km south of Lampi. They are a self-sufficient lot, subsisting on fishing, hunting, and collecting eagle-wood (Aquilaria agallocha), mother-of-pearl, turbo shells, turtle eggs and sea cucumber.
What makes the island enchanting is the fascinating variety of wildlife found here. Among the mammals there are: an indigenous subspecies of the Lesser Mouse Deer, Small-clawed Otter, Crab-eating Macaque and langur (Tragulus javanicus lampensis, Aonyx cinera, Macaca fasicularis and Presbytis sp). With the apparent absence of predators, there is an abundance of Indian Muntjac (Muntiacus muntjak) and Wild Boar (Stir scrofa) to be found. A large colony of flying foxes (Pteropus hypomelanus) thrives on the small island of Pulau Myang Basa in the Gregory group. The delightful Dolphins (Delphinidae) are commonly sighted, and the Dugong (Dugong dugon) may still occur in the area. Notable birds found here include Nicobar Pigeon (Caloenas nicobarica) and the Edible-nest Swiftlet (Collocalia fuciphaga), the latter inhabiting the caves of Pub Tika. There are many raptors in the area including the (Pandion haliaetus, Haliastur indus and Haliaeetus leucogaster). Monitor lizards (Varanus sp) are some of the reptiles that roam freely. Given the presence of a number of suitable nesting beaches for sea-turtles, there is however, a surprisingly small number of turtles found here in the islands.