Sugar, rice, indigo and tropical fruits are the chief products of the fertile district in which the town lies; it is widely known for its fish-ponds and its excellent fish, and its principal manufactures are jusi, pina, ilang ilang perfume and sugar.
In the interior of the mines are sixteen ponds, of which the large lake of Przykos is 195 ft.
Hilly plateaus are still in the same geological phase, and are dotted with numberless lakes and ponds, while the rivers continue to dig out their yet undetermined channels.
In freshwater lakes and ponds, especially if the water is stagnant, aquatic plants are abundant.
Plymouth is a popular resort for visitors,, having, in addition to its wealth of historic associations and a healthy summer climate, thousands of acres of hilly woodland and numerous lakes and ponds well stocked with fish.