Sameba (Georgian: სამება [sameba]; formerly Gunia-Kala, Kastron; Greek: Γκουνιά-Καλά, Κάστρον; Georgian: გუნიაკალა [ɡuniɑkʼɑlɑ]) is a predominantly Greek village in Tsalka Municipality, Georgia.

In the 1930s one could still find older residents speaking the Pontic dialect of Greek.

After the Second World War some people in the village retained the language, but the rest switched to speaking Turkish and Russian.

By the time of the collapse of the USSR there were about 700 households in Gunia-Kala, in which there lived more than 2000 people.

In 2002 236 residents remained in the village, 72% of which were Greeks and 18% Georgians.