I have not been there, but The Gambia is a small, very poor country, with an AIDS problem, on the west coast of Africa that has been trying, with some success to build a tourist industry. It is named after the Gambia river - I believe. And that is all I know without looking it up.

The only other place with a similar name that comes to mind is not a country but a town in the Netherlands - The Hague (or Den Hague).