Bitung is a city on the northern coast of the island of Sulawesi in Indonesia. It is in the province of North Sulawesi, and faces Lembeh Island (which forms two districts of the city) and the Lembeh Strait, which is known for its colourful marine life, in particular sea slugs. Bitung has a population of 187,932 at the 2010 Census, making it the second most populated city in the province after the capital Manado, rising to 225,134 at the 2020 Census.