The largest land snail on the Earth is the giant Ghana snail (Achatina achatina). The shell of this mollusk grow to a length of 18 cm (7.1 in) with a diameter of 9 cm (3.5 in).
Source: https://dinoanimals.com
The largest known giant Ghana snail has shell length about 30 cm (1 ft) with a diameter of 15 cm (0.5 ft). This species of snail lives in the West Africa: Ghana, Nigeria, Sierra Leone, Ivory Coast, Benin, Liberia and Togo.
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